M16CSLASH62P datasheet(65/349 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.

• Ring Oscillator Mode

The ring oscillator clock divided by 1 (undivided), 2, 4, 8 or 16 provides the CPU clock. The ring

oscillator clock is also the clock source for the peripheral function clocks. If the sub clock is on, fC32

can be used as the count source for timers A and B.

• Ring Oscillator Low Power Dissipation Mode

The main clock is turned off after being placed in ring oscillator mode. The CPU clock can be selected

as in the ring oscillator mode. The ring oscillator clock is the clock source for the peripheral function

clocks. If the sub clock is on, fC32 can be used as the count source for timers A and B. When the

operation mode is returned to the high and medium speed modes, set the CM06 bit to “1” (divided by

8 mode).

Modes

CM2 register

CM21

CM1 register

CM11

CM17, CM16

CM0 register

CM07

CM06

CM05

CM04

PLL operation mode

1002

High-speed mode

002

Midium-

speed

mode

012

102

divided by 2

112

Low-speed mode

Low power dissipation mode

1(Note 1)

Ring

oscillator

mode

divided by 4

divided by 8

divided by 16

Ring oscillator low power

dissipation mode

Note 1: When the CM05 bit is set to “1” (main clock turned off) in low-speed mode, the mode goes to low power

dissipation mode and CM06 bit is set to “1” (divided by 8 mode) simultaneously.

Note 2: The divide-by-n value can be selected the same way as in ring oscillator mode.

1012

1102

1112

1002

(Note 2)

divided by 2

divided by 4

divided by 8

divided by 16

divided by 1

1(Note 1)

(Note 2)

(2) Wait Mode

In wait mode, the CPU clock is turned off, so are the CPU (because operated by the CPU clock) and the

watchdog timer. However, if the PM22 bit of PM2 register is “1” (ring oscillator clock for the watchdog

timer count source), the watchdog timer remains active. Because the main clock, sub clock, ring oscillator

clock and PLL clock all are on, the peripheral functions using these clocks keep operating.

• Peripheral Function Clock Stop Function

If the CM02 bit is “1” (peripheral function clocks turned off during wait mode), the f1, f2, f8, f32, f1SIO,

f8SIO, f32SIO and fAD clocks are turned off when in wait mode, with the power consumption reduced

that much. However, fC32 remains on.

• Entering Wait Mode

The microcomputer is placed into wait mode by executing the WAIT instruction.

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 then the PLC07 bit to “0” (PLL turned off) before entering wait mode.

• Pin Status During Wait Mode

Table 1.9.4 lists pin status during wait mode

• Exiting Wait Mode

______

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

tion interrupt.

______

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

peripheral function interrupt priority ILVL2 to ILVL0 bits to “0002” (interrupts disabled) before execut-

ing the WAIT instruction.

The peripheral function interrupts are affected by the CM02 bit. If CM02 bit is “0” (peripheral function

clocks not turned off during wait mode), all peripheral function interrupts can be used to exit wait

Table 1.9.3. Setting Clock Related Bit and Modes

M16C/62P Datasheet(PDF) 65 Page - Mitsubishi Electric Semiconductor

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