M16CSLASH62P datasheet(67/349 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock Generation Circuit

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

(3) Stop Mode

In stop mode, all oscillator circuits are turned off, so are the CPU clock and the peripheral function clocks.

Therefore, the CPU and the peripheral functions clocked by these clocks stop operating. The least

amount of power is consumed in this mode. If the voltage applied to Vcc1 and Vcc2 pins is VRAM or more,

the internal RAM is retained. When applying 2.7 or less voltage to Vcc1 and Vcc2 pins, make sure

Vcc1

≥Vcc2≥VRAM.

However, the peripheral functions clocked by external signals keep operating. The following interrupts

can be used to exit stop mode.

______

• NMI interrupt

• Key interrupt

______

• INT interrupt

• Timer A, Timer B interrupt (when counting external pulses in event counter mode)

• Serial I/O interrupt (when external clock is seleted)

• Entering Stop Mode

The microcomputer is placed into stop mode by setting the CM10 bit of CM1 register to “1” (all clocks

turned off). At the same time, the CM06 bit of CM0 register is set to “1” (divide-by-8 mode) and the

CM15 bit of CM10 register is set to “1” (main clock oscillator circuit drive capability high).

Before entering stop mode, set the CM20 bit to “0” (oscillation stop, re-oscillation detection function

disable).

Also, if the CM11 bit is “1” (PLL clock for the CPU clock source), set the CM11 bit to “0” (main clock for

the CPU clock source) and the PLC07 bit to “0” (PLL turned off) before entering stop mode.

• Pin Status in Stop Mode

Table 1.9.6 lists pin status during stop mode

• Exiting Stop Mode

______

The microcomputer is moved out of stop mode by a hardware reset, NMI interrupt or peripheral func-

tion interrupt.

______

If the microcomputer is to be moved out of stop mode by a hardware reset or NMI interrupt, set the

peripheral function interrupt priority ILVL2 to ILVL0 bits to “0002” (interrupts disable) before setting the

CM10 bit to “1”.

If the microcomputer is to be moved out of stop mode by a peripheral function interrupt, set up the

following before setting the CM10 bit to “1”.

1. In the ILVL2 to ILVL0 bits of interrupt control register, set the interrupt priority level of the periph-

eral function interrupt to be used to exit stop mode.

Also, for all of the peripheral function interrupts not used to exit stop mode, set the ILVL2 to ILVL0

bits to “0002”.

2. Set the I flag to “1”.

3. Enable the peripheral function whose interrupt is to be used to exit stop mode.

In this case, when an interrupt request is generated and the CPU clock is thereby turned on, an

interrupt service routine is executed.

______

Which CPU clock will be used after exiting stop mode by a peripheral function or NMI interrupt is

determined by the CPU clock that was on when the microcomputer was placed into stop mode as

follows:

If the CPU clock before entering stop mode was derived from the sub clock: sub clock

If the CPU clock before entering stop mode was derived from the main clock: main clock divide-by-8

If the CPU clock before entering stop mode was derived from the ring oscillator clock: ring oscillator

clock divide-by-8

M16C/62P Datasheet(PDF) 67 Page - Mitsubishi Electric Semiconductor

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