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15
MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[3]
SCI1 Transmit/Receive Buffer Register (S1BUF)
S1BUF is an 8-bit register that holds transmit/receive data during a serial port transmit/
receive operation. S1BUF has a double structure, in which the content is different in
READ/WRITE. If in read, S1BUF functions as a receive buffer, and if in write, S1BUF
functions as a transmit buffer.
When a receive operation ends, the content of the receive register is transferred to the
S1BUF receive buffer, and a receive interrupt request is generated at the same time.
The content of the S1BUF receive buffer is held until the next receive operation ends.
When receive mode is in UART/synchronous multiprocessor communication mode, if
data has been received instead of reception of an address and if the receive data is
ignored, the content of S1BUF is not updated even at completion of the receive opera-
tion, also a receive interrupt request is not generated.
The 4-stage buffer mode is not provided for SCI1.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), S1BUF becomes undefined.
[4]
SCI1 Transmit and Receive Registers
The SCI1 transmit and receive registers are two 8-bit shift registers that actually per-
form shift operations during a transmit/receive operation.
The transmit and receive registers and transmit/receive buffer register (S1BUF) have a
double structure. When a receive operation ends, the data received by the receive
register is transferred to S1BUF, and a receive interrupt request is generated.
The transmit and receive registers cannot be read/written by the program.
[5]
SCI1 Status Register (S1STAT)
The high-order 4 bits of S1STAT is the transmit-ready/receive-ready interrupt request
control register of the serial port. The low-order 4 bits of S1STAT is the register that
holds the status (normal/abnormal) when the serial port receive operation is completed.
The low-order 4-bits of S1STAT are updated when receive ends. Once S1STAT is set
("1": error occurred), it is not reset to "0" even if an error does not occur when the next
receive ends. Therefore reset to "0" any bits that are "1" of the low-order 4 bits of
S1STAT by the program when a receive ends.
The contents of S1BUF must be read before resetting OERR1 (bit 1) of the low-order 4
bits of S1STAT to "0". Otherwise, the OERR1 flag is set to "1" again irrespective of
occurrence of an overrun error in next receive operation.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), S1STAT becomes 00H.
Figure 15-11 shows the configuration of S1STAT.
Содержание ML66592
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002 ...
Страница 15: ...Contents 12 ...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1 ...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2 ...
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Страница 44: ...CPU Architecture Chapter 3 3 ...
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Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture ...
Страница 102: ...CPU Control Functions Chapter 4 4 ...
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Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions ...
Страница 112: ...Memory Control Functions Chapter 5 5 ...
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Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions ...
Страница 118: ...Port Functions Chapter 6 6 ...
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Страница 152: ...Output Pin Control Pin OE Chapter 7 7 ...
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Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE ...
Страница 156: ...Clock Generation Circuit Chapter 8 8 ...
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Страница 160: ...Time Base Counter TBC Chapter 9 9 ...
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Страница 164: ...Watchdog Timer WDT Chapter 10 10 ...
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Страница 170: ...Flexible Timer FTM Chapter 11 11 11 ...
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Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM ...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12 ...
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Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function ...
Страница 224: ...PWM Functions Chapter 13 13 ...
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Страница 244: ...Baud Rate Generator Functions Chapter 14 14 ...
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Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions ...
Страница 264: ...Serial Port Functions Chapter 15 15 ...
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Страница 348: ...A D Converter Functions Chapter 16 16 ...
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Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions ...
Страница 382: ...Transition Detector Functions Chapter 17 17 ...
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Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions ...
Страница 388: ...Peripheral Functions Chapter 18 18 ...
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Страница 392: ...External Interrupt Request Function Chapter 19 19 ...
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Страница 396: ...Interrupt Request Processing Function Chapter 20 20 ...
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Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function ...
Страница 408: ...Bus Port Functions Chapter 21 21 ...
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Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions ...
Страница 414: ...Expansion Port Chapter 22 22 ...
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Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23 ...
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Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5 ...
Страница 432: ...RAM Monitor Function Chapter 24 24 ...
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Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function ...
Страница 442: ...25 Electrical Characteristics Chapter 25 ...
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Страница 458: ...Package Dimensions Chapter 26 26 ...
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Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions ...
Страница 462: ...Revision History Chapter 27 27 ...
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Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History ...