M306H7MG-XXXFP Datasheet, PDF (36/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
4. CLOCK GENERATION CIRCUIT
Table 4.2
Pin Status During Wait Mode
Pin
Single-chip mode
_______
_______
A0 to A19, D0 to D15, CS0 to CS3,
________
BHE
_____ ______ ________ _________
RD, WR, WRL, WRH
__________
HLDA,BCLK
ALE
I/O ports
CLKOUT
When fC selected
When f8, f32 selected
Retains status before wait mode
Does not stop
Does not stop when the CM02
bit is “0”.
When the CM02 bit is “1”, the
status immediately prior to
entering wait mode is main-
tained.
Table 4.3 Interrupts to Exit Wait Mode
Interrupt
CM02=0
NMI interrupt
Can be used
Serial I/O interrupt
Can be used when operating
with internal or external clock
CM02=1
Can be used
Can be used when operating
with external clock
A-D conversion
interrupt
Can be used in one-shot mode
or single sweep mode
(Do not use)
Timer A interrupt
Timer B interrupt
INT interrupt
Can be used in all modes
Can be used
Can be used in event counter
mode or when the count
source is fC32
Can be used
Table 4.3 lists the interrupts to exit wait mode.
If the microcomputer is to be moved out of wait mode by a peripheral function interrupt, set up the following
before executing the WAIT instruction.
(1) In the ILVL2 to ILVL0 bits of interrupt control register, set the interrupt priority level of the peripheral
function interrupt to be used to exit wait mode. Also, for all of the peripheral function interrupts not used to
exit wait mode, set the ILVL2 to ILVL0 bits to “0002” (interrupt disable).
(2) Set the I flag to “1”.
(3) Enable the peripheral function whose interrupt is to be used to exit wait mode. In this case, when an
interrupt request is generated and the CPU clock is thereby turned on, an interrupt routine is executed.
The CPU clock turned on when exiting wait mode by a peripheral function interrupt is the same CPU clock that
was on when the WAIT instruction was executed.
Rev.2.10 Oct 25, 2006 Page 36 of 326
REJ03B0152-0210