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MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[7]
SCI2 Status Register 1 (S2STAT1)
If the SR2EXP bit of SR2CON is set to "1" (4-stage buffer mode), the 6-bit S2STAT1
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
S2BUF1, the lower 3 bits of S2STAT1 (bits 1–3) are updated when reception of that
data is complete; if there is an error in the receive data transferred to S2BUF2, the
upper 3 bits of S2STAT1 (bits 5–7) are updated when reception of that data is com-
plete. Once S2STAT1 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 S2STAT1 bits that are "1" after reception is complete. Read the con-
tents of S2BUF1 and S2BUF2 before resetting the OERR21 and OERR22 flags in
S2STAT1. If the contents of S2BUF1 and S2BUF2 are not read, the OERR21 and
OERR22 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), S2STAT1 becomes 11H.
Figure 15-15 shows the configuration of S2STAT1.
<Description of Each Bit>
• OERR21 (bit 1)
When an SCI2 receive operation is complete and the receive data is transferred into
S2BUF1, OERR21 is set to "1" if the data transferred into S2BUF1 for the previous
reception has not yet been read by the CPU. New receive data is loaded into
S2BUF1 even if OERR21 has been set. (Overrun error)
• PERR21 (bit 2)
With SCI2, the parity of data received by S2BUF1 is compared to the parity bit
appended to and transferred with the data. If they do not match, PERR21 is set to
"1". (Parity error)
• MERR21 (bit 3)
During the SCI2 UART multiprocessor communication mode, MERR21 is set to "1" if
an address is transmitted while S2BUF1 is receiving data. In other words, when the
MPC bit (of the data that is transferred when the SR2MPC bit of SR2CON is "0") is
"1", MERR21 is set to "1", interpreting this as a multiprocessor communication error.
• OERR22 (bit 5)
When an SCI2 receive operation is complete and the receive data is transferred into
S2BUF2, OERR22 is set to "1" if the data transferred into S2BUF2 for the previous
reception has not yet been read by the CPU. New receive data is loaded into
S2BUF2 even if OERR22 has been set. (Overrun error)
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...
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Страница 18: ...Overview Chapter 1 1...
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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 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 156: ...Clock Generation Circuit Chapter 8 8...
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Страница 388: ...Peripheral Functions Chapter 18 18...
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