Module Standby Mode; Setting Module Standby Mode; Clearing Module Standby Mode - Hitachi H8/3827R Series Hardware Manual

5.9

Module Standby Mode

5.9.1

Setting Module Standby Mode

Module standby mode is set for individual peripheral functions. All the on-chip peripheral
modules can be placed in module standby mode. When a module enters module standby mode,
the system clock supply to the module is stopped and operation of the module halts. This state is
identical to standby mode.
Module standby mode is set for a particular module by setting the corresponding bit to 0 in clock
stop register 1 (CKSTPR1) or clock stop register 2 (CKSTPR2). (See table 5.5.)
5.9.2

Clearing Module Standby Mode

Module standby mode is cleared for a particular module by setting the corresponding bit to 1 in
clock stop register 1 (CKSTPR1) or clock stop register 2 (CKSTPR2). (See table 5.5.)
Following a reset, clock stop register 1 (CKSTPR1) and clock stop register 2 (CKSTPR2) are both
initialized to H'FF.
Table 5.5 Setting and Clearing Module Standby Mode by Clock Stop Register
Register Name Bit Name
CKSTPR1 TACKSTP
TCCKSTP
TFCKSTP
TGCKSTP
ADCKSTP
S32CKSTP
S31CKSTP
116
Operation
1 Timer A module standby mode is cleared
0 Timer A is set to module standby mode
1 Timer C module standby mode is cleared
0 Timer C is set to module standby mode
1 Timer F module standby mode is cleared
0 Timer F is set to module standby mode
1 Timer G module standby mode is cleared
0 Timer G is set to module standby mode
1 A/D converter module standby mode is cleared
0 A/D converter is set to module standby mode
1 SCI3-2 module standby mode is cleared
0 SCI3-2 is set to module standby mode
1 SCI3-1 module standby mode is cleared
0 SCI3-1 is set to module standby mode