M32CSLASH8B datasheet(99/406 Pages) RENESAS

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Under development

M32C/8B Group

9. Clock Generation Circuits

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 82 of 385

9.4

Clock Output Function

The CLKOUT pin outputs fC, f8, or f32.

The BCLK clock, which has the same frequency as the CPU clock, can be output from the BCLK pin in memory

expansion mode or microprocessor mode.

Table 9.4 lists CLKOUT pin function in single-chip mode. Table 9.5 lists CLKOUT pin function in memory

expansion mode and microprocessor mode.

Table 9.4

CLKOUT Pin Function in Single-Chip Mode

NOTE:

1. Rewrite the CM0 register after setting the PRC0 bit in the PRCR register to 1 (write enable).

Table 9.5

CLKOUT Pin Function in Memory Expansion Mode and Microprocessor Mode

NOTES:

1. Change the CM0 register after setting the PRC0 bit in the PRCR register to 1 (write enable).

2. Change registers PM0 and PM1 after setting the PRC1 bit in the PRCR register to 1 (write enable).

CM0 Register(1)

P5_3/CLKOUT Pin Function

Bits CM01 and CM00

00b

I/O port P5_3

01b

Outputs fC

10b

Outputs f8

11b

Outputs f32

CM0 Register(1)

PM1 Register(2)

PM0 Register(2)

CLKOUT/BCLK/ALE Pin Function

Bits CM01 and CM00

Bits PM15 and PM14

PM07 bit

00b

10b

11b

Outputs BCLK

Outputs “L”

(does not function as P5_3)

01b

0 or 1

Outputs ALE

01b

0 or 1

Outputs fC

10b

0 or 1

Outputs f8

11b

0 or 1

Outputs f32

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