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Digital I/O ............................................................................................ 35
Serial Communication .......................................................................... 36
RS-232 Communication .................................................................. 38
Receive and Transmit Buffers ....................................................... 38
CTS/RTS Control ......................................................................... 39
Modem Communication ............................................................... 39
RS-485 Communication .................................................................. 40
Developing an RS-485 Network ................................................... 40
Use of the Serial Ports ..................................................................... 42
Z180 Serial Ports .......................................................................... 43
Asynchronous Serial Communication Interface ................................... 45
ASCI Status Registers ..................................................................... 45
/DCD0 (Data Carrier Detect) ........................................................ 45
TIE (Transmitter Interrupt Enable) ............................................... 45
TDRE (Transmitter Data Register Empty) ................................... 45
CTS1E (CTS Enable, Channel 1) ................................................. 46
RIE (Receiver Interrupt Enable) ................................................... 46
FE (Framing Error) ....................................................................... 46
PE (Parity Error) ........................................................................... 46
OVRN (Overrun Error) ................................................................ 46
RDRF (Receiver Data Register Full) ............................................ 46
ASCI Control Register A ................................................................ 47
MOD0–MOD2 (Data Format Mode Bits) .................................... 47
MPBR/EFR (Multiprocessor Bit Receive/Error Flag Reset) ........ 47
/RTS0 (Request to Send, Channel 0) ............................................ 47
CKA1D (CKA1 Disable) .............................................................. 47
TE (Transmitter Enable) ............................................................... 47
RE (Receiver Enable) ................................................................... 48
MPE (Multiprocessor Enable) ...................................................... 48
ASCI Control Register B ................................................................ 48
SS (Source/Speed Select) ............................................................. 48
DR (Divide Ratio) ........................................................................ 49
PEO (Parity Even/Odd) ................................................................ 49
/CTS/PS (Clear to Send/Prescaler) ............................................... 49
MP (Multiprocessor Mode) .......................................................... 49
MPBT (Multiprocessor Bit Transmit) .......................................... 49
Chapter 4: Software
51
Supplied Software ................................................................................ 52
Digital I/O ............................................................................................ 53
Real-Time Clock (RTC) ....................................................................... 54
Display ................................................................................................. 55
Flash EPROM ................................................................................. 55
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OP7100