MPC823 datasheet(17/74 Pages) MOTOROLA

17 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-395

16.11.6.10 SMCx UART MODE REGISTER. When a serial management controller is in

UART mode, the 16-bit, memory-mapped, read/write SMCx mode register is referred to as

the SMCx UART mode register (SMCMR–UART). The functionality of bits 8-15 is common

to each SMCx protocol, but bits 0-7 vary according to the protocol selected by the SM field.

This register is cleared by reset.

Bits 0 and 8–9—Reserved

These bits are reserved and must be set to 0.

CLEN—Character Length

This field must be programmed with the total number of bits in the character minus one. The

total number of bits in the character is calculated as the sum of 1 (start bit always present)

+ number of data bits (5 to 14) + number of parity bits (0 or 1) + number of stop bits (1 or 2).

For example, for 8 data bits, no parity, and 1 stop bit, the total number of bits in the character

is 1 + 8 + 0 + 1 = 10. In this case, CLEN must be programmed to 9.

The number of data bits in the character ranges from 5 to 14 bits. If the data bit length is less

than 8 bits, the most-significant bits of each byte in memory are not used on transmission

and are written with zeros on reception. On the other hand, if the data bit length is more than

8 bits, the most-significant bits of each 16-bit word in memory are not used on transmit and

are written with zeros on receive.

SL—Stop Length

0 = One stop bit.

1 = Two stop bits.

PEN—Parity Enable

0 = No parity.

1 = Parity is enabled for the transmitter and receiver, depending on the PM bit setting.

SMCMR–UART

BIT

FIELD

RES

CLEN

PEN

RES

TEN

REN

RESET

000

R/W

ADDR

(IMMR & 0xFFFF0000) + 0xA82 (SMC1), 0xA92 (SMC2)

Note: The total number of bits in the character must never exceed 16. Thus, if you

choose a 14-bit data length, set SL to one stop bit and disable parity. If you

choose a 13-bit data length and parity is enabled, set SL to one stop bit. To

prevent erratic behavior, do not write the values 0-3 to CLEN.

MPC823 Datasheet(PDF) 17 Page - Motorola, Inc

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