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15-62
MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[7]
SCI4 Status Register 1 (S4STAT1)
If the SR4EXP bit of SR4CON is set to "1" (4-stage buffer mode), the 6-bit S4STAT1
register stores the status (normal/abnormal) of the serial transfer when a serial port
receive operation is completed.
During the 4-stage buffer mode, if there is an error in the receive data transferred to
S4BUF1, the lower 3 bits of S4STAT1 (bits 1–3) are updated when reception of that
data is complete; if there is an error in the receive data transferred to S4BUF2, the
upper 3 bits of S4STAT1 (bits 5–7) are updated when reception of that data is com-
plete. Once S4STAT1 is set to "1" ("1": error occurred), it is not reset to "0" even if that
error has not occurred at completion of the next reception. Therefore, with the program,
reset to "0" any S4STAT1 bits that are "1" after reception is complete. Read the con-
tents of S4BUF1 and S4BUF2 before resetting the OERR41 and OERR42 flags in
S4STAT1. If the contents of S4BUF1 and S4BUF2 are not read, the OERR41 and
OERR42 flags will be set to "1" again regardless of whether an overrun error occurs in
the 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), S4STAT1 becomes 11H.
Figure 15-27 shows the configuration of S4STAT1.
<Description of Each Bit>
• OERR41 (bit 1)
When an SCI4 receive operation is complete and the receive data is transferred into
S4BUF1, OERR41 is set to "1" if the data transferred into S4BUF1 for the previous
reception has not yet been read by the CPU. New receive data is loaded into
S4BUF1 even if OERR41 has been set. (Overrun error)
• PERR41 (bit 2)
With SCI4, the parity of data received by S4BUF1 is compared to the parity bit
appended to and transferred with the data. If they do not match, PERR41 is set to
"1". (Parity error)
• MERR41 (bit 3)
During the SCI4 UART multiprocessor communication mode, MERR41 is set to "1" if
an address is transmitted while S4BUF1 is receiving data. In other words, when the
MPC bit (of the data that is transferred when the SR4MPC bit of SR4CON is "0") is
"1", MERR41 is set to "1", interpreting this as a multiprocessor communication error.
• OERR42 (bit 5)
When an SCI4 receive operation is complete and the receive data is transferred into
S4BUF2, OERR42 is set to "1" if the data transferred into S4BUF2 for the previous
reception has not yet been read by the CPU. New receive data is loaded into
S4BUF2 even if OERR42 has been set. (Overrun error)
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 ...
Страница 161: ......
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 ...