M306H2MC-XXXFP Datasheet, PDF (36/210 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306H2MC-XXXFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA ACQUISITION CONTROLLER
2.5.3 Clock output
In single-chip mode, the clock output function select bits (bits 0 and 1 at address 000616) enable f8,
f32, or fc to be output from the P57/CLKOUT pin. When the WAIT peripheral function clock stop bit (bit
2 at address 000616) is set to “1”, the output of f8 and f32 stops when a WAIT instruction is executed.
2.5.4 Stop Mode
Writing “1” to the main clock and sub-clock stop control bit (bit 0 at address 000716) stops oscillation
and the microcomputer enters stop mode. In stop mode, the content of the internal RAM is retained
provided that VCC remains above 2V.
The internal oscillator circuit of expansion function (Data acquisition / humming function) stops oscilla-
tion when expansion register XTAL_VCO, PDC_VCO_ON, VPS_VCO_ON = "L".
Because the oscillation , BCLK, f1 to f32, f1SIO2 to f32SIO2, fC, fC32, and fAD stops in stop mode, periph-
eral functions such as the A-D converter and watchdog timer do not function. However, timer A and
timer B operate provided that the event counter mode is set to an external pulse, and UARTi(i = 0 to 2)
SI/O3,4 functions provided an external clock is selected. Table 2.5.2 shows the status of the ports in
stop mode.Stop mode is cancelled by a hardware reset or interrupt. If an interrupt is to be used to
cancel stop mode, that interrupt must first have been enabled. If returning by an interrupt, that interrupt
routine is executed.When shifting from high-speed/medium-speed mode to stop mode and at a reset,
the main clock division select bit 0 (bit 6 at address 000616) is set to “1”. When shifting from low-speed/
low power dissipation mode to stop mode, the value before stop mode is retained.
Table 2.5.2 Port status during stop mode
Pin
Address bus,data bus,CS0 to CS3,
BHE
RD,WR,WRL,WRH
HLDA,BCLK
ALE
Port
CLKOUT
When fC selected
When f8,f32 selected
Memory expansion mode
Microprocessor mode
Retains status before wait mode
“H ”
“H ”
“H ”
Retains status before wait mode
Valid only in single-chip mode
Valid only in single-chip mode
Single-chip mode
Retains status before wait mode
Does not stop
Does not stop when the WAIT
peripheral function clock stop
bit is “0 ”.
When the WAIT peripheral
function clock stop bit is “1 ”,
the status immediately prior
to entering wait mode is main-
tained.
Rev. 1.0
35