M306V2ME Datasheet, PDF (41/276 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
2.5.4 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.
2.5.5 Stop Mode
Writing “1” to the all-clock stop control bit (bit 0 at address 000716) stops all oscillation and the microcom-
puter enters stop mode. In stop mode, the content of the internal RAM is retained provided that VCC
remains above 4.5V.
Because the oscillation, BCLK, f1 to f32, f1SIO2 to f32SIO2, fC, fC32, and fAD stops in stop mode, peripheral
functions such as the A-D converter and watchdog timer do not function. However, timer B operates
provided that the event counter mode is set to an external pulse, and UARTi (i = 0, 2) 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 an 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
Memory expansion mode
Single-chip mode
_______
_______
Address bus, data bus, CS0 to CS3
_____ ______ ________ ________ _________
RD, WR, BHE, WRL, WRH
__________
HLDA, BCLK
Microprocessor mode
Retains status before stop mode
“H”
“H”
ALE
“H”
Port
Retains status before stop mode Retains status before stop mode
CLKOUT When fc selected
Valid only in single-chip mode “H”
When f8, f32 selected
Valid only in single-chip mode Retains status before stop mode
Rev. 1.0
41