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15-9
15
MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[3]
SCI0 Transmit/Receive Buffer Register (S0BUF0)
S0BUF0 is an 8-bit register that holds transmit/receive data during a serial port transmit/
receive operation. S0BUF0 has a double structure, in which the contents are different in
read/write. If in read, S0BUF0 functions as a receive buffer, and if in write, S0BUF0
functions as a transmit buffer.
When a receive operation ends, the content of the receive register is transferred to the
S0BUF0 receive buffer, and a receive interrupt request is generated at the same time.
The content of the S0BUF0 receive buffer is held until the next receive operation ends.
When receive mode is in UART multiprocessor communication mode, and if receive
data is ignored, the content of S0BUF0 is not updated even at completion of the receive
operation, and a receive interrupt request is not generated.
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), S0BUF0 becomes unde-
fined.
[4]
SCI0 Receive Buffer Registers (S0BUF1, S0BUF2, S0BUF3)
S0BUF1, S0BUF2, and S0BUF3 are 8-bit registers that store valid received data when
the SR0EXP bit of SR0CON is set to "1" (4-stage buffer mode).
These registers are read-only and cannot be written to. During the 4-stage buffer mode,
at the completion of each 1-byte reception, the contents of the receive register are
transferred to a receive buffer register in the order of S0BUF0, S0BUF1, S0BUF2,
S0BUF3, S0BUF0, etc. At the same time, a receive interrupt request is generated.
(Ring Buffer Type)
When the receive mode is the UART multiprocessor communication mode and the
received data is ignored, the contents of S0BUF1, S0BUF2, and S0BUF3 will not be
updated and a receive interrupt request will not be generated even after completion of a
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), the contents of S0BUF1,
S0BUF2, and S0BUF3 are undefined.
[5]
SCI0 Transmit and Receive Registers
The SCI0 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 the transmit/receive buffer registers have a
double structure. If a receive operation ends, during single buffer mode the data re-
ceived by the receive register is transferred to S0BUF0, and during 4-stage buffer mode
it is transferred to S0BUF0, S0BUF1, S0BUF2, and S0BUF3 in this order, and a receive
interrupt request is generated.
The transmit and receive registers cannot be read/written by the program.
Содержание MSM66591
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...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Страница 112: ...Memory Control Functions Chapter 5 5...
Страница 113: ......
Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
Страница 153: ......
Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Страница 156: ...Clock Generation Circuit Chapter 8 8...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10...
Страница 165: ......
Страница 170: ...Flexible Timer FTM Chapter 11 11 11...
Страница 171: ......
Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
Страница 215: ......
Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Страница 224: ...PWM Functions Chapter 13 13...
Страница 225: ......
Страница 244: ...Baud Rate Generator Functions Chapter 14 14...
Страница 245: ......
Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Страница 264: ...Serial Port Functions Chapter 15 15...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Страница 382: ...Transition Detector Functions Chapter 17 17...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Страница 388: ...Peripheral Functions Chapter 18 18...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20...
Страница 397: ......
Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Страница 408: ...Bus Port Functions Chapter 21 21...
Страница 409: ......
Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Страница 414: ...Expansion Port Chapter 22 22...
Страница 415: ......
Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
Страница 421: ......
Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Страница 432: ...RAM Monitor Function Chapter 24 24...
Страница 433: ......
Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Страница 442: ...25 Electrical Characteristics Chapter 25...
Страница 443: ......
Страница 458: ...Package Dimensions Chapter 26 26...
Страница 459: ......
Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Страница 462: ...Revision History Chapter 27 27...
Страница 463: ......
Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...