AM8530 datasheet(22/194 Pages) AMD

22 / 194 page

System Interface

AMD

2–4

Table 2–1. Register Set

Read Register Functions

RR0

Transmit/Receive buffer status, and External status

RR1

Special Receive Condition status, residue codes, error conditions

RR2

Modified (Channel B only) interrupt vector and Unmodified interrupt

vector (Channel A only)

RR3

Interrupt Pending bits (Channel A only)

*RR6

14-bit frame byte count (LSB)

*RR7

14-bit frame byte count (MSB), frame status

RR8

Receive buffer

RR10

Miscellaneous XMTR, RCVR status parameters

RR12

Lower byte of baud rate generator time constant

RR13

Upper byte of baud rate generator time constant

RR15

External/Status interrupt control information

* Available only when Am85C30 is programmed in enhanced mode.

Write Register Functions

WR0

Command Register, (Register Pointers), CRC initialization, resets

for various modes

WR1

Interrupt conditions, Wait/DMA request control

WR2

Interrupt vector (access through either channel)

WR3

Receive/Control parameters, number of bits per character, Rx CRC

enable

WR4

Transmit/Receive miscellaneous parameters and codes, clock rate,

number of sync characters, stop bits, parity

WR5

Transmit parameters and control, number of Tx bits per character,

Tx CRC enable

WR6

Sync character (1st byte) or SDLC address

WR7

SYNC character (2nd byte) or SDLC flag

**WR7

′

SDLC options; auto flag, RTS, EOM reset, extended read, etc.

WR8

Transmit buffer

WR9

Master interrupt control and reset (accessed through either

channel), reset bits, control interrupt daisy chain

WR10

Miscellaneous transmitter/receiver control bits, NRZI, NRZ, FM

encoding, CRC reset

WR11

Clock mode control, source of Rx and Tx clocks

WR12

Lower byte of baud rate generator time constant

WR13

Upper byte of baud rate generator time constant

WR14

Miscellaneous control bits: baud rate generator, Phase-Locked

Loop control, auto echo, local loopback

WR15

External/Status interrupt control information-control external

conditions causing interrupts

** Only available in Am85C30.

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