Specifications

Chapter 8
SERIAL COMMUNICATIONS (16C452)
Contents Page
OVERVIEW ..................................................... 8-2
SERIAL COMMUNICATIONS PROTOCOL
....................... 8-3
SERIAL INTERFACE (RS-232-C/422/485)
......................... 8-8
RS-232-C vs. RS-422/485
.................................... 8-10
Signal Definitions
........................................... 8-11
Clear-To-Send Inputs (CTS0*, CTS1*)
.................... 8-11
Data-Set-Ready (DSR0*, DSR1*)
......................... 8-11
Data-Terminal-Ready (DTR0*, DTR1*)
................... 8-12
Serial Channel Interrupt Outputs (INT0, INT1)
............. 8-12
Ring Indicator Inputs (RI0*, RI1*)
........................ 8-13
Receive Line Signal Detect (RLSD0*, RLSD1*)
............ 8-13
Reset Control (RESET*)
................................. 8-14
Request-To-Send (RTS0*, RTS1*)
........................ 8-15
Serial Data Inputs (SIN0, SIN1)
........................... 8-15
Serial Data Outputs (SOUT0, SOUT1)
..................... 8-15
SERIAL REGISTERS
........................................... 8-16
Transmit and Receive Buffer Registers
........................ 8-20
Scratchpad Register
......................................... 8-20
Line Control Register
........................................ 8-21
Baud Rate Generator
......................................... 8-24
Line Status Register
......................................... 8-26
Interrupt ID Register
......................................... 8-28
Interrupt Enable Register
..................................... 8-30
Modem Control Register
..................................... 8-31
Modem Status Register
...................................... 8-33
8-1