M32CSLASH8A datasheet(106/372 Pages) RENESAS

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M32C/8A Group

9. Clock Generation Circuits

Rev.1.00

Jul 15, 2007

Page 89 of 352

REJ09B0385-0100

9.5.2.3

Pin States in Wait Mode

Table 9.6 lists pin states in wait mode.

Table 9.6

Pin States in Wait Mode

9.5.2.4

Exiting Wait Mode

Wait mode is exited by the hardware reset 1, hardware reset 2, NMI interrupt, Vdet4 detection interrupt, or

peripheral function interrupts.

As for a peripheral function interrupt that is not used to exit wait mode, set bits ILVL2 to ILVL0 in the Interrupt

Control Register for the peripheral function interrupt to 000b (interrupt disabled) before executing the WAIT

instruction.

The CM02 bit setting in the CM0 register affects the use of the peripheral function interrupts to exit wait mode.

When the CM02 bit is set to 0 (peripheral clocks do not stop in wait mode), any peripheral function interrupts

can be used to exit wait mode. When the CM02 bit is set to 1 (peripheral clocks stop in wait mode), the

peripheral functions clocked by the peripheral function clocks stop, and therefore, the peripheral function

interrupts cannot be used to exit wait mode. However, the peripheral functions clocked by the external clock

and fC32 do not stop regardless of the CM02 bit setting. Also, f2n, which uses the XIN clock (fXIND) or on-

chip oscillator clock as its clock source does not stop. The interrupts generated by the peripheral functions

which operate using these clocks can be used to exit wait mode.

When the MCU exits wait mode by the peripheral function interrupts or NMI interrupt, the CPU clock does not

change before and after the WAIT instruction is executed.

Table 9.7 lists interrupts to be used to exit wait mode and usage conditions.

States

Address bus, data bus, CS0 to CS3, BHE

Maintain the state immediately before entering wait mode

RD, WR, WRL, WRH

“H”

HLDA, BCLK

“H”

ALE

“L”

Ports

Maintain the state immediately before entering wait mode

CLKOUT

When fC is selected

Continue to output the clock

When f8, f32 are selected • When the CM02 bit in the CM0 register is 0 (peripheral clocks

do not stop in wait mode): Continue to output the clock

• When the CM02 bit is 1 (peripheral clocks stop in wait mode):

The clock is stopped and holds the level immediately before

entering wait mode

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