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MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
<Synchronous Normal Master Mode (SCI1 only)>
The clock pulse (BRG1), generated by the baud rate generator (S1TM), is divided by 4
to generate the receive shift clock (SR1CLK), and the receive data sampling clock is
generated (refer to Figure 15-34).
The 2nd pulse of the 1/4 division becomes the input sampling clock of the RXD1 pin,
and the 3rd pulse becomes SR1CLK. The receive circuit controls the fetching of the
receive data synchronizing with SR1CLK.
The receive operation is started when SR1REN of SR1CON is set to "1", and the
SR1FREE signal, that indicates receiving, is set to "L" level.
When SR1FREE becomes "L" level, the receive shift clock is output from the RXC1 pin
synchronizing with the next SR1CLK. The receive data just sampled is shifted in the
receive register by the next SR1CLK.
Sampling of receive data is performed only once.
When the receive shift clock rises, SR1CLK is generated, and receive data is shifted in
the receive register. Therefore the transmit side transmits the transmit data synchroniz-
ing with the fall of the transmit shift clock.
Hereafter, the receive shift clock is output from the RXC1 pin according to the specifica-
tion of SR1CON, and receive data is sequentially shifted in the receive register.
If the final output of the receive shift clock ends, the receive end signal LSR1BUF is
generated synchronizing with the next SR1CLK.
If LSR1BUF is generated, the content of the receive register (receive data) is trans-
ferred to S1BUF, an overrun error and parity error (if parity bit exists) are set, the
receive interrupt request signal (RX1READY) is generated synchronizing with the M1S1
signal that indicates the beginning of an instruction, and the interrupt request flag
(QSCI1) is set to "1". Then SR1FREE becomes "H" level, SR1REN of SR1CON be-
comes "0", and the receive operation ends.
<Synchronous Multiprocessor Communication Master Mode (SCI1 only)>
In synchronous multiprocessor communication master mode, receive is controlled by
the same timing as synchronous normal master mode. The differences are shown
below.
• Setting of multiprocessor communication error
• If SR1MPC of SR1CON is "0", receive data is accepted regardless of the MPC bit of
receive data. When SR1MPC of SR1CON is "1", receive data is accepted if the MPC
bit of receive data is "1", but receive data is not accepted if the MPC bit of receive
data is "0". This means that data shifted in the shift register will not be loaded to
S1BUF, and also that an interrupt request wii not be generated.
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 ...