M32C83T datasheet(103/527 Pages) RENESAS

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Page 80

8. Clock Generation Circuit

)

(

8.3.3 fC32

fC32 is the sub clock divided by 32. fC32 is used for as a count source for the timers A and B. fC32 is

available when the sub clock is running.

8.4 Clock Output Function

The CLKOUT pin outputs fC, f8 or f32.

In memory expansion and microprocessor modes, a clock having the same frequency as the CPU clock

can be output from the BCLK pin as BCLK.

Table 8.4 lists CLKOUT pin function in single-chip mode. Table 8.5 lists CLKOUT pin functions in memory

expansion and microprocessor modes.

Table 8.4 CLKOUT Pin in Single-Chip Mode

- : Can be set to either "0" or "1"

NOTES:

1. Rewrite the PM0 register after the PRC1 bit in the PRCR register is set to "1" (write enable)

2. Rewrite the CM0 register after the PRC0 bit in the PRCR register is set to "1" (write enable)

Table 8.5 BLCK/CLKOUT Pin in Memory Expansion Mode and Microprocessor Mode(4)

PM07

CM01

CM00

CLKOUT Pin Function

P53 I/O port

Outputs fc

Outputs f8

Outputs f32

PM0 Register (1)

CM0 Register (2)

- : Can be set to either "0" or "1"

NOTES:

1. Rewrite the PM0 and PM1 register after the PRC1 bit in the PRCR register is set to "1" (write enable)

2. Rewrite the CM0 register after the PRC0 bit in the PRCR register is set to "1" (write enable)

3. When the PM07 bit is set to "0" (selected in the CM01 to CM00 bits) or the PM15 to PM14 bits are set

to "012" (P53/BCLK), set the CM01 to CM00 bits to "002" (I/O port P53)

4. M32C/83T cannot be used in memory expansion mode and microprocessor mode.

8.5 Power Consumption Control

Normal operation mode, wait mode and stop mode are provided as the power consumption control.

All mode states, except wait mode and stop mode, are called normal operation mode in this document.

Figure 8.14 shows a block diagram of status transition in wait mode and stop mode. Figure 8.15 shows a

block diagram of status transition in all modes.

0 (3)

002, 102, 112,

Outputs BCLK

Outputs "L" (not P53)

Outputs fc

Outputs f8

0 (3)

Outputs f32

Outputs ALE

0 (3)

PM07

CM01

CM00

PM14

CLKOUT Pin Function

PM15

PM0 Register(1)

CM0 Register(2)

PM1 Register(1)

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