%
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42
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(98/12/10)
Address DifferenceDP83840ADP83840Destination
1Bh 10BTSR 0x0 0x0
1Ch 10BTCR 0xa3b9 0xa3b9
1Dh–1Fh --
4. 2. 7. RS232 Interface
Notes
The RS232/RS485 Interfaces reside in six Z85C230 providing 12 sepa-
rate channels.
Channel A is intended to be the ”console”, channel B to L to be ”tty01”,
”tty02”,..., ”tty09”,”tty10”,”tty20”
tty10 and tty20 are configured as RS485 channels
The frequency of PCLK at pin 23 of Z85C230 is 10 MHz
Device Codes
Address
Destination Read/Write
Byte Format
3210
1F020xxx Channel B Control Register, tty01 R/W xxxb
1F021xxx Channel B Data Register, tty01 R/W xxxb
1F022xxx Channel A Control Register, cons. R/W xxxb
1F023xxx Channel A Data Register, cons. R/W xxxb
1F024xxx Channel D Control Register, tty03 R/W xxxb
1F025xxx Channel D Data Register, tty03 R/W xxxb
1F026xxx Channel C Control Register, tty02 R/W xxxb
1F027xxx Channel C Data Register, tty02 R/W xxxb
1F030xxx Channel F Control Register, tty05 R/W xxxb
1F031xxx Channel F Data Register, tty05 R/W xxxb
1F032xxx Channel E Control Register, tty04 R/W xxxb
1F033xxx Channel E Data Register, tty04 R/W xxxb
1F034xxx Channel H Control Register, tty07 R/W xxxb
1F035xxx Channel H Data Register, tty07 R/W xxxb
1F036xxx Channel G Control Register, tty06 R/W xxxb
1F037xxx Channel G Data Register, tty06 R/W xxxb
1F038xxx Channel J Control Register, tty20 R/W xxxb
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