M16CSLASH29 datasheet(77/499 Pages) RENESAS

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7. Clock Generation Circuit

page 53

Figure 7.7 PLC0 Register and CCLKR register

PLC00

PLC01

PLC02

PLC07

(3)

(4)

Function

NOTES:

1. Write to this register after setting the PRC0 bit in the PRCR register to 1 (write enable).

2. When the PM21 bit in the PM2 register is 1 (clock modification disable), writing to this register has no effect.

3. These three bits can only be modified when the PLC07 bit is set to 0 (PLL turned off). The value once written to

this bit cannot be modified.

4. Before setting this bit to 1 , set the CM07 bit to 0 (main clock), set bits CM17 to CM16 bits to 002 (main

clock undivided mode), and set the CM06 bit to 0 (CM16 and CM17 bits enable).

PLL Control Register 0 (1,2)

PLL multiplying factor

select bit

Nothing is assigned. If necessary, set to 0.

When read, the content is undefined

Operation enable bit

0 0 0:

0 0 1: Multiply by 2

0 1 0: Multiply by 4

0 1 1:

1 0 0:

1 0 1:

1 1 0:

1 1 1:

0: PLL Off

1: PLL On

Bit Name

Bit

Symbol

Address

After Reset

PLC0

001C16

0001X0102

b1b0

Reserved bit

Set to 0

Do not set

Reserved bit

Set to 1

Do not set

(b4)

(b6-b5)

(b3)

b7 b6 b5 b4 b3 b2 b1 b0

0 1

0 0 0 No division

0 0 1: Divide-by-2

0 1 0: Divide-by-4

0 1 1: Divide-by-8

1 0 0: Divide-by-16

1 0 1:

1 1 0:

Inhibited

1 1 1:

b2 b1 b0

CAN0 clock select bits(2)

CAN0 CPU interface

sleep bit(3)

0: CAN0 CPU interface operating

1: CAN0 CPU interface in sleep

Bit Name

Function

Bit Symbol

CCLK3

CCLK1

CCLK2

CCLK0

Symbol

Address

After Reset

CCLKR

025F16

0016

NOTES:

1. Write to this register after setting the PRC0 bit in the PRCR register to 1 (write enable).

2. Configuration of bits CCLK2 to CCLK0 can be done only when the Reset bit in the C0CTLR register is set to 1

(Reset/Initialization mode).

3. Before setting this bit to 1(CAN0 CPU interface in sleep), set the Sleep bit in C0CTLR register to 1 (Sleep

mode).

CAN0 Clock Select Register (1)

b7 b6 b5 b4 b3 b2 b1 b0

(b7-b4)

Nothing is assigned. If necessary, set to 0. When read,

the content is 0

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