M16CSLASH1N datasheet(38/238 Pages) RENESAS

38 / 238 page

Rev.1.00

Oct 20, 2004

page 26 of 222

M16C/1N Group

6. Clock Generation Circuit

REJ09B0007-0100Z

b5 b4

Clock prescaler reset flag

Symbol

CPSRF

Address

008F16

When reset

0XXXXXXX2

Function

Bit name

Bit symbol

CPSR

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

Clock prescaler reset flag

0 : No effect

1 : Prescaler is reset

(When read, the value is "0")

CM20

CM21

CM22

CM23

Main clock switch bit

Oscillation stop detection

interrupt enable bit

Oscillation stop

detection bit

Clock monitor bit (Note 5)

Reserved bit

Set to "0"

Note 1: In case of writing to this register, set bit 0 of the protect register (address 000A16) to "1".

Note 2: Set to "0" before stopping the oscillation of the main clock (XIN-XOUT).

(stop mode, low power dissipation mode, on-chip oscillation mode)

An oscillation stop is detected if the oscillation of the main clock (XIN-XOUT) is stopped when the following

two conditions are satisfied: (1) the oscillation stop detection function is valid and (2) CM21=1.

Note 3: Valid when CM20=1.

Note 4: CM22 bit switches to "1" automatically if an oscillation stop is detected when both CM20 bit and CM 21 bit

are "1". CM22 bit cannot be cleared when CM23=1.

Note 5: This bit is valid when both CM20 bit is "1". Use this bit for the purpose of confirming XIN operation for

oscillation stop detection interrupt execution.

b5 b4

0 : XIN oscillating normally

1 : XIN stopping abnormally

0 : Select XIN clock

1 : Select on-chip oscillator (Note 4)

0 : Disabled

1 : Enabled (Note 3)

0 : The function is invalid

1 : The function is valid (Note 2)

Oscillation stop detection register (Note 1)

Symbol

CM2

Address

000C16

When reset

000001002

Function

Bit name

Bit symbol

Figure 6.3 Oscillation stop detection register and clock prescaler reset flag

Figure 6.4 fC32 block diagram

1/32

Reset

Clock prescaler

fC32

XCIN

Clock prescaler reset flag (bit 7

at address 008F16) set to "1"

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