Renesas M16C/50 Series User Manual page 172

M16C/5L Group, M16C/56 Group
9.4.2.2 Low Current Consumption Read Mode
Low current consumption read mode can be used when the CM07 bit in the CM0 register is 1 (sub
clock used as CPU clock). Figure 9.4 shows Setting and Canceling Low Current Consumption Read
Mode.
Note:
1. Do not rewrite bits FMR22 and FMR23 simultaneously.
Figure 9.4 Setting and Canceling Low Current Consumption Read Mode
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
Low current consumption read mode
Set the CM07 bit to 1 (sub clock used as a CPU clock)
Set the CM05 bit to 1 (main clock oscillator stop)
and the FRA00 bit to 0 (40 MHz on-chip oscillator
stopped)
Set the FMR22 bit to 0
and then to 1 (slow read mode enabled)
Set the FMR23 bit to 0 and then to 1
(low current consumption read mode enabled)
Processing in low current consumption read mode
Set the FMR23 bit to 0
Set the FMR22 bit to 0
Completed
Setting
procedure
(1)
(1)
(1)
(1)
9. Power Control
Canceling
procedure
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