The Z180’s two independent, full-duplex asynchrono" />
參數(shù)資料
型號: 20-101-0732
廠商: Rabbit Semiconductor
文件頁數(shù): 65/126頁
文件大?。?/td> 0K
描述: INTERFACE SMART SCREEN OP7100
標準包裝: 1
系列: SBC
模塊/板類型: 單板計算機模塊
適用于相關產(chǎn)品: OP7100
其它名稱: 20-101-732
20-101-732-ND
OP7100
Hardware
43
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 Z180s 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 3-22 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 3-22 are directly accessible as internal
registers.
Figure 3-22. 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
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