M32C80 Datasheet, PDF (93/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
8. Clock Generation Circuit
8.5.2.3 Pin Status in Wait Mode
Table 8.7 lists pin states in wait mode.
Table 8.7 Pin States in Wait Mode
Pin
_______
_______
Address Bus, Data Bus, CS0 to CS3,
________
BHE
_____ ______ ________ _________
RD, WR, WRL, WRH
__________
HLDA, BCLK
Memory Expansion Mode
Microprocessor Mode
Maintains state immediately
before entering wait mode
"H"
"H"
Single-Chip Mode
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).
8.5.2.4 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 8.8 shows interrupts to be used to exit wait mode and usage conditions.
Rev. 1.00 Nov. 01, 2005 Page 74 of 330
REJ09B0271-0100