M32CSLASH86 datasheet(102/505 Pages) RENESAS

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Page 79

9. Clock Generation Circuit

)

(

Figure 9.8 PM2 Register

PM21

(b0)

PM22

PM26

PM27

0 : Clock selected by the CM07 bit

1 : Main Clock

0 : f1

1 : Main Clock

CPU Clock Select Bit 3

CAN Clock Select Bit

PM24

PM25

(b3)

Processor Mode Register 2(1)

After Reset

0016

Address

001316

Symbol

PM2

System Clock Protect

Bit(2, 3)

WDT Count Source

Protect Bit(2, 4)

Bit Name

Function

Bit

Symbol

Reserved Bit

Set to "0"

0 : Protects the clock by a PRCR

1 : Disables a clock change

0 : Selects BCLK as count source of

the watchdog timer

1 : Selects the on-chip oscillator

clock as count source of the

watchdog timer

Reserved Bit

Set to "0"

NOTES:

1. Rewrite the PM2 register after the PRC1 bit in the PRCR register is set to "1" (write enable).

2. Once the PM22 and PM21 bits are set to "1", they can not be set to "0" by program.

3. When the PM21 bit is set to "1",

the CPU clock keeps running when the WAIT instruction is executed;

nothing is changed even if following bits are set to either "0" or "1".

• the CM02 bit in the CM0 register (the peripheral function clock is not stopped in wait mode.)

• the CM05 bit in the CM0 register (the main clock is not stopped.)

• the CM07 bit in the CM0 register (a CPU clock source is not changed.)

• the CM10 bit in the CM1 register (the microcomputer does not enter stop mode.)

• the CM17 bit in the CM1 register (a CPU clock source is not changed.)

• the CM20 bit in the CM2 register (oscillation stop detect function settings are not changed.)

• all bits in the PLC0 and PLC1 registers (PLL frequency synthesizer function settings are not changed.)

4. When the PM22 bit is set to "1",

the on-chip oscillator clock becomes a count source of the watchdog timer after the on-chip oscillator starts;

write to the CM10 bit is disabled (the microcomputer does not enter stop mode.);

the watchdog timer keeps running when the microcomputer is in wait mode and hold state.

0 0 : Peripheral function clock

0 1 : XIN clock

1 0 : On-chip oscillator clock

1 1 : Do not set to this value

f2n Count source

Select Bit

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