OP7100
42
s
Hardware
Z180 Serial Ports
The
Z180
s two independent, full-duplex asynchronous serial channels
have a separate baud-rate generator for each channel. The baud rate can be
divided down from the microprocessor clock, or from an external clock for
either or both channels.
The serial ports have a multiprocessor communications feature. When
enabled, this feature adds an extra bit to the transmitted character (where
the parity bit would normally go). Receiving
Z180
s can be programmed to
ignore all received characters except those with the extra multiprocessing
bits enabled. This provides a
1
-byte attention message that can be used to
wake up a processor without the processor having to intelligently monitor
all traffic on a shared communications link.
The block diagram in Figure 3-21 shows Serial Channel 0. Serial Chan-
nel 1 is similar, but control lines for
/RTS
and
/DCD
do not exist. The five
unshaded registers shown in Figure 3-21 are directly accessible as internal
registers.
Figure 3-21. Z180 Serial Channel 0
Microprocessor Internal Bus
RDR0
TDR0
TSR0
RXA0
TXA0
Shift Register Out
Shift Register In
Baud-Rate
Generator
CKA0
CNTLA0
STAT0
CNTLB0
/RTS0
/CTS0
/DCD0
RSR0
Содержание OP7100
Страница 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 020418 J ...
Страница 10: ...OP7100 x s About This Manual ...
Страница 16: ...OP7100 16 s Overview ...
Страница 50: ...OP7100 50 s Hardware ...
Страница 51: ...OP7100 Software s 51 CHAPTER 4 SOFTWARE Chapter 4 describes the Dynamic C functions used with the OP7100 ...
Страница 72: ...OP7100 72 s Software ...
Страница 80: ...OP7100 80 s Graphics Programming ...
Страница 86: ...OP7100 86 s Installation ...
Страница 96: ...OP7100 96 s Specifications ...
Страница 110: ...110 s Serial Interface Board 2 OP7100 ...
Страница 111: ...OP7100 Backup Battery s 111 APPENDIX E BACKUP BATTERY ...
Страница 114: ...OP7100 114 s Backup Battery ...
Страница 122: ...OP7100 122 s Index ...