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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)
Summary of Contents for ML66592
Page 15: ...Contents 12 ...
Page 17: ......
Page 18: ...Overview Chapter 1 1 ...
Page 19: ......
Page 30: ...Description of Pins Chapter 2 2 ...
Page 31: ......
Page 44: ...CPU Architecture Chapter 3 3 ...
Page 45: ......
Page 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture ...
Page 102: ...CPU Control Functions Chapter 4 4 ...
Page 103: ......
Page 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions ...
Page 112: ...Memory Control Functions Chapter 5 5 ...
Page 113: ......
Page 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions ...
Page 118: ...Port Functions Chapter 6 6 ...
Page 119: ......
Page 152: ...Output Pin Control Pin OE Chapter 7 7 ...
Page 153: ......
Page 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE ...
Page 156: ...Clock Generation Circuit Chapter 8 8 ...
Page 157: ......
Page 160: ...Time Base Counter TBC Chapter 9 9 ...
Page 161: ......
Page 164: ...Watchdog Timer WDT Chapter 10 10 ...
Page 165: ......
Page 170: ...Flexible Timer FTM Chapter 11 11 11 ...
Page 171: ......
Page 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM ...
Page 214: ...General Purpose 8 Bit Timer Function Chapter 12 12 ...
Page 215: ......
Page 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function ...
Page 224: ...PWM Functions Chapter 13 13 ...
Page 225: ......
Page 244: ...Baud Rate Generator Functions Chapter 14 14 ...
Page 245: ......
Page 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions ...
Page 264: ...Serial Port Functions Chapter 15 15 ...
Page 265: ......
Page 348: ...A D Converter Functions Chapter 16 16 ...
Page 349: ......
Page 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions ...
Page 382: ...Transition Detector Functions Chapter 17 17 ...
Page 383: ......
Page 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions ...
Page 388: ...Peripheral Functions Chapter 18 18 ...
Page 389: ......
Page 392: ...External Interrupt Request Function Chapter 19 19 ...
Page 393: ......
Page 396: ...Interrupt Request Processing Function Chapter 20 20 ...
Page 397: ......
Page 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function ...
Page 408: ...Bus Port Functions Chapter 21 21 ...
Page 409: ......
Page 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions ...
Page 414: ...Expansion Port Chapter 22 22 ...
Page 415: ......
Page 420: ...Serial Port with FIFO SCI5 Chapter 23 23 ...
Page 421: ......
Page 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5 ...
Page 432: ...RAM Monitor Function Chapter 24 24 ...
Page 433: ......
Page 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function ...
Page 442: ...25 Electrical Characteristics Chapter 25 ...
Page 443: ......
Page 458: ...Package Dimensions Chapter 26 26 ...
Page 459: ......
Page 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions ...
Page 462: ...Revision History Chapter 27 27 ...
Page 463: ......
Page 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History ...