MPC823 datasheet(5/74 Pages) MOTOROLA

5 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-383

• The parameter RAM values that pertain to the SMCx transmitter can only be written

when the TEN bit in the SMCMR is zero or after the STOP TRANSMIT command is

issued, but before the RESTART TRANSMIT command is issued.

• The parameter RAM values that pertain to the SMCx receiver can only be written when:

t The REN bit in the SMCMR is zero.

t The receiver is previously enabled after the ENTER HUNT MODE command is

issued.

t The CLOSE RX BD command is issued before the REN bit is set.

Table 16-36. SMCx (UART and Transparent) Parameter RAM Memory Map

ADDRESS

NAME

WIDTH

DESCRIPTION

SMCx Base + 00

RBASE

Half-Word

RX Buffer Descriptor Base Address

SMCx Base + 02

TBASE

Half-Word

TX Buffer Descriptor Base Address

SMCx Base + 04

RFCR

Byte

RX Function Code

SMCx Base + 05

TFCR

Byte

TX Function Code

SMCx Base + 06

MRBLR

Half-Word

Maximum Receive Buffer Length

SMCx Base + 08

RSTATE

Word

RX Internal State

SMCx Base + 0C

RPTR

Word

RX Internal Data Pointer

SMCx Base + 10

RBPTR

Half-Word

RX Buffer Descriptor Pointer

SMCx Base + 12

RCNT

Half-Word

RX Internal Byte Count

SMCx Base + 14

RTMP

Word

RX Temp

SMCx Base + 18

TSTATE

Word

TX Internal State

SMCx Base + 1C

TPTR

Word

TX Internal Data Pointer

SMCx Base + 20

TBPTR

Half-Word

TX Buffer Descriptor Pointer

SMCx Base + 22

TCNT

Half-Word

TX Internal Byte Count

SMCx Base + 24

TTMP

Word

TX Temp

SMCx Base + 28

First Word of Protocol-Specific Area

SMCx Base + 36

Last Word of Protocol-Specific Area

NOTE:

You are only responsible for initializing the items in bold.

SMCx Base = (IMMR & 0xFFFF0000) + 0x3E80 (SMC1) and 0x3F80 (SMC2).

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