M16C30P_07 Datasheet, PDF (69/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
9. Clock Generating Circuit
9.4.2 Wait Mode
In wait mode, the CPU clock is turned off, so are the CPU (because operated by the CPU clock) and the
watchdog timer. Because the main clock and sub clock all are on, the peripheral functions using these clocks
keep operating.
9.4.2.1 Peripheral Function Clock Stop Function
If the CM02 bit in the CM0 register is “1” (peripheral function clocks turned off during wait mode), the f1, f2,
f8, f32, f1SIO, f8SIO, f32SIO and fAD clocks are turned off when in wait mode, with the power consumption
reduced that much. However, fC32 remains on.
9.4.2.2 Entering Wait Mode
The microcomputer is placed into wait mode by executing the WAIT instruction.
9.4.2.3 Pin Status During Wait Mode
Table 9.3 lists Pin Status During Wait Mode.
Table 9.3 Pin Status During Wait Mode
Pin
Memory Expansion Mode
Microprocessor Mode
Single-Chip Mode
A0 to A19, D0 to D15, CS0 to CS3, ^{Retains status before wait mode Does not become a bus control}
BHE
pin
RD, WR, WRL, WRH
“H”
HLDA, BCLK
“H”
ALE
“L”
I/O ports
Retains status before wait mode Retains status before wait mode
CLKOUT When fC selected
Does not become a CLKOUT pin Does not stop
When f8, f32 selected
Does not stop when the CM02 bit
is “0”.
When the CM02 bit is “1”, the
status immediately prior to
entering wait mode is
maintained.
Rev.1.22 Mar 29, 2007 Page 53 of 291
REJ09B0179-0122