M16CSLASH62P datasheet(73/349 Pages) MITSUBISHI

73 / 349 page

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.

Oscillation Stop and Re-oscillation Detect Function

The oscillation stop and re-oscillation detect function is such that main clock oscillation circuit stop and re-

oscillation are detected. At oscillation stop, re-oscillation detection, reset or oscillation stop, re-oscillation

detection interrupt are generated. Which is to be generated can be selected using the CM27 bit of CM2

Table 1.9.7. Specification Overview of Oscillation Stop and Re-oscillation Detect Function

Item

Specification

Oscillation stop detectable clock and

f(XIN)

≥ 2 MHz

frequency bandwidth

Enabling condition for oscillation stop,

Set CM20 bit to “1”(enable)

re-oscillation detection function

Operation at oscillation stop,

•Reset occurs (when CM27 bit =0)

re-oscillation detection

•Oscillation stop, re-oscillation detection interrupt occurs(when CM27 bit =1)

(1) Operation When CM27 bit = 0 (Oscillation Stop Detection Reset)

Where main clock stop is detected when the CM20 bit is “1” (oscillation stop, re-oscillation detection

function enabled), the microcomputer is initialized, coming to a halt (oscillation stop reset; refer to “SFR”,

“Reset”).

This status is reset with hardware reset 1 or hardware reset 2. Also, even when re-oscillation is detected,

the microcomputer can be initialized and stopped; it is, however, necessary to avoid such usage. (During

main clock stop, do not set the CM20 bit to “1” and the CM27 bit to “0”.)

(2) Operation When CM27 bit = 0 (Oscillation Stop and Re-oscillation Detect Interrupt)

Where the main clock corresponds to the CPU clock source and the CM20 bit is “1” (oscillation stop and

re-oscillation detect function enabled), the system is placed in the following state if the main clock comes

to a halt:

• Oscillation stop and re-oscillation detect interrupt request occurs.

• The ring oscillator starts oscillation, and the ring oscillator clock becomes the CPU clock and clock

source for peripheral functions in place of the main clock.

• CM21 bit = 1 (ring oscillator clock for CPU clock source)

• CM22 bit = 1 (main clock stop detected)

• CM23 bit = 1 (main clock stopped)

Where the PLL clock corresponds to the CPU clock source and the CM20 bit is “1”, the system is placed

in the following state if the main clock comes to a halt: Since the CM21 bit remains unchanged, set it to “1”

(ring oscillator clock) inside the interrupt routine.

• Oscillation stop and re-oscillation detect interrupt request occurs.

• CM22 bit = 1 (main clock stop detected)

• CM23 bit = 1 (main clock stopped)

• CM21 bit remains unchanged

Where the CM20 bit is “1”, the system is placed in the following state if the main clock re-oscillates from

the stop condition:

• Oscillation stop and re-oscillation detect interrupt request occurs.

• CM22 bit = 1 (main clock re-oscillation detected)

• CM23 bit = 0 (main clock oscillation)

• CM21 bit remains unchanged

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