Datasheet

Section 6 Power-Down Modes
REJ09B0465-0300 Rev. 3.00 Page 151 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
6.4 Module Standby Function
The module standby function is available for any peripheral module. When a module is set to the
module standby state, the clock supply to the module stops placing the module in the power-down
state. Setting the corresponding bit to the module in MSTCR to 1 places the module in the module
standby state and clearing the bit cancels the module standby state. After release from a reset, all
the modules except timer RE are in the module standby state; to use a module, cancel the module
standby state of it.
Note that the registers of the module in the module standby state cannot be accessed.
6.5 PSC Divider Stop Function
When the peripheral modules do not use the PSC divider output, the PSC divider can be stopped
by setting the PSCSTP bit in LPCR1 to 1.
When the PSC divider is stopped, the peripheral modules using φ/2 to φ/8192 can be stopped as
shown in table 6.1 (register values are retained). Before setting the PSCSTP bit to 1, set the
peripheral modules using the PSC divider output to the module standby state.
After release from a reset, the PSC divider is stopped since the PSCSTP bit is set to 1. For the
PSCSTP bit, see section 5.2.3, Power-Down Control Register 1 (LPCR1).