ST92185B datasheet(61/178 Pages) STMICROELECTRONICS

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ST92185B - RESET AND CLOCK CONTROL UNIT (RCCU)

4.5 RESET CONTROL UNIT REGISTERS

The RCCU consists of two registers. They are

PCONF and SDRATH. Unless otherwise stated,

unused register bits must be kept in their reset val-

ue in order to avoid problems with the device be-

haviour.

PLL CONFIGURATION REGISTER (PCONF)

R251 - Read/Write

Reset value: 0000 0111 (07h)

Bit 7= SRESEN.

Software Reset Enable.

0: RCCU PLL and CSDU are turned off when a

HALT instruction is performed.

1: RCCU will reset the microcontroller when a

HALT instruction is performed.

Bit 6:0= Reserved bits. Leave in their reset state.

CLOCK SLOW DOWN UNIT RATIO REGISTER

(SDRATH)

R254 - Read/Write

Reset value:

0010 0xxx (2xh) after software reset

0100 0xxx (4xh) after watchdog reset

0000 0000 (00h) after external reset

Bit 7 = Reserved bit. Leave in its reset state.

Bit 6 = WDGRES.

Watchdog Reset. WDGRES is

automatically set if the last reset was a watchdog

Reset. This is a read only bit.

Bit 5 = SFTRES.

Software Reset. SFTRES is au-

tomatically set if the last reset was a software Re-

set. This is a read only bit.

Bit 4:0 = Reserved bits. Please leave in their reset

state.

SRESEN

WDGRES SFTRES

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