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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.
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 ...
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 ...
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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 ...
Страница 225: ......
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 ...
Страница 265: ......
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 ...
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 ...
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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 ...