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MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[8]
SCI3 Status Register 2 (S3STAT2)
If the SR3EXP bit of SR3CON is set to "1" (4-stage buffer mode), the lower 3 bits of
S3STAT2 store the status (normal/abnormal) of the serial transfer when a serial port
receive operation is completed. The upper 2 bits of S3STAT2 monitor the counter that
indicates the receive buffer into which receive data will be transferred at completion of
the next receive operation.
During the 4-stage buffer mode, if there is an error in the receive data transferred to
S3BUF3, the lower 3 bits of S3STAT2 (bits 1–3) are updated when reception of that
data is complete. Once the lower 3 bits of S3STAT2 are set to "1" ("1": error occurred),
they are 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 bits that are "1" of the lower 3
bits of S3STAT2 after reception is complete. Read the contents of S3BUF3 before
resetting the OERR33 flag in the lower 3 bits of S3STAT2. If the contents of S3BUF3
are not read, the OERR33 flag will be set to "1" again regardless of whether an overrun
error occurs in the next receive operation.
Bits 4 and 5 of S3STAT2 are read-only and cannot be written to. During the 4-stage
buffer mode, the next receive buffer into which data will be transferred (S3BUF0,
S3BUF1, S3BUF2, S3BUF3) can be verified by reading bits 4 and 5 of S3STAT2.
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), S3STAT2 becomes C1H.
Figure 15-22 shows the configuration of S3STAT2.
<Description of Each Bit>
• OERR33 (bit 1)
When an SCI3 receive operation is complete and the receive data is transferred into
S3BUF3, OERR33 is set to "1" if the data transferred into S3BUF3 for the previous
reception has not yet been read by the CPU. New receive data is loaded into
S3BUF3 even if OERR33 has been set. (Overrun error)
• PERR33 (bit 2)
With SCI3, the parity of data received by S3BUF3 is compared to the parity bit
appended to and transferred with the data. If they do not match, PERR33 is set to
"1". (Parity error)
• MERR33 (bit 3)
During the SCI3 UART multiprocessor communication mode, MERR33 is set to "1" if
an address is transmitted while S3BUF3 is receiving data. In other words, when the
MPC bit (of the data that is transferred when the SR3MPC bit of SR3CON is "0") is
"1", MERR33 is set to "1", interpreting this as a multiprocessor communication error.
• BFCU30 (bit 4), BFCU31 (bit 5)
During the 4-stage buffer mode, BFCU30 and BFCU31 monitor the buffer counter
that indicates the receive buffer into which receive data will be transferred (S3BUF0,
S3BUF1, S3BUF2, S3BUF3) at completion of the next receive operation. BFCU30
and BFCU31 are read-only and cannot be written to.
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...
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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...
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...
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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...
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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...
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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...