M32CSLASH86 datasheet(112/505 Pages) RENESAS

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Page 89

9. Clock Generation Circuit

)

(

9.5.2.3 Pin Status in Wait Mode

Table 9.7 lists pin states in wait mode.

Table 9.7 Pin States in Wait Mode

Memory Expansion Mode(1)

Single-Chip Mode

Microprocessor Mode(1)

_______

Address Bus, Data Bus, CS0 to CS3,

Maintains state immediately

________

BHE

before entering wait mode

_____

______

________

_________

RD, WR, WRL, WRH

"H"

__________

HLDA, BCLK

"H"

ALE

"L"

Ports

Maintains state immediately before entering wait mode

CLKOUT

When fC is selected

Outputs clock

When f8, f32 are selected

Outputs the clock when the CM02 bit in the CM0 register is set to "0"

(peripheral function clock does not stop in wait mode).

Maintains state immediately before entering wait mode when the CM02

bit is set to "1" (peripheral function clock stops in wait mode).

NOTES:

1. M32C/86T cannot be used in memory expansion mode and microprocessor mode.

9.5.2.4 Exiting Wait Mode

_______

Wait mode is exited by the hardware reset, NMI interrupt or peripheral function interrupts.

_______

When the hardware reset or NMI interrupt, but not the peripheral function interrupts, is used to exit wait

mode, set the ILVL2 to ILVL0 bits for the peripheral function interrupts to "0002" (interrupt disabled)

before executing the WAIT instruction.

CM02 bit setting affects the peripheral function interrupts. When the CM02 bit in the CM0 register is

set to "0" (peripheral function clock does not stop in wait mode), all peripheral function interrupts can

be used to exit wait mode. When the CM02 bit is set to "1" (peripheral function clock stops in wait

mode), peripheral functions using the peripheral function clock stop. Therefore, the peripheral function

interrupts cannot be used to exit wait mode. However, the peripheral function interrupts caused by an

external clock, fC32, or f2n whose count source is the XIN clock or on-chip oscillator clock, can be used

to exit wait mode.

_______

The CPU clock used when exiting wait mode by the peripheral function interrupts or NMI interrupt is

the same CPU clock used when the WAIT instruction is executed.

Table 9.8 shows interrupts to be used to exit wait mode and usage conditions.

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