STLC5464 datasheet(55/83 Pages) STMICROELECTRONICS

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VIII - INTERNAL REGISTERS

‘Not used’ bits (Nu) are accessible by the microprocessor but the use of these bits by software is not

recommended.

‘Reserved’ bits are not implemented in the circuit. However, it is not recommended to use this address.

VIII.1 - Identification and Dynamic Command Register - IDCR (00)H

bit15

bit8

bit7

bit 0

C15

C14

C13

C12

C11

C10

When this register is read by the microprocessor, the circuit code C0/15 is returned. Reset has no effect

on this register.

C0/3 indicates the version.

C4/7 indicates the revision.

C8/11 indicates the foundry.

C12/15 indicates the type.

Example : this code is (0010)H for the first sample.

When this register is written by the microprocessor then :

bit15

bit8

bit7

bit 0

RSS

WDR

: TOKEN LAUNCH

When TL is set to 1 by the microprocessor, the token pulse is launched from the TRO pin (Token

Ring Output pin). This pulse is provided to the TRI pin (Token Ring Input pin) of the next circuit

in the applications where several

Multi-HDLCs are connected to the same shared memory.

WDR

: WATCHDOG RESET.

When the bit 1 (WDR) of this register is set to 1 by the microprocessor, the watchdog counter is

reset.

RSS

: RESET SOFTWARE

When the bit 2 (RSS) of this register is set to 1 by the microprocessor, the circuit is reset (Same

action as reset pin).

After writing this register, the values of these three bits return to the default value.

VIII.2 - General Configuration - GCR (02)H

bit15

bit8

bit7

bit 0

MBL

AFAB

SCL

BSEL SELB

CSD

HCL

SYN1 SYN0

EVM

TSV

TRD

PMA

WDD

After reset (0000)H

WDD

: Watch Dog Disable

WDD = 1, the Watch Dog is masked : WDO pin stays at ”0”.

WDD = 0, the Watch Dog generates an ”1” on WDO pin if the microprocessor has not reset the

Watch Dog during the duration programmed in Timer Register.

PMA

: Priority Memory Access

PMA = 1, if the token ring has been launched it is captured and kept in order to authorize

memory accesses.

PMA = 0, memory is accessible only if the token is present; after one memory access the token

is re-launched from TRO pin of the current circuit to TRI pin of the next circuit.

TRD

: Token Ring Disable

TRD = 1, if the token has been launched, the token ring is stopped and destroyed ; memory

accesses are not possible. The token will not appear on TRO pin.

TRD = 0, the token ring is authorized ; when the token will be launched,it will appear on TRO pin.

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