32186 datasheet(889/1032 Pages) RENESAS

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OSCILLATOR CIRCUIT

20-7

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

20.1.4 System Clock Output Function

A clock twice the frequency of the input clock, i.e., a peripheral clock, can be output from the BCLK pin. This

peripheral clock, either directly or after being divided by 2, can be output as an external bus clock from the

CLKOUT pin. This BCLK pin is shared with port P70. The CLKOUT pin is shared with port P70 or port P150.

The output pins for the peripheral clock BCLK and the external bus clock CLKOUT are listed in Table 20.1.1. A

CLKOUT and BCLK select structure is shown in Figure 20.1.5.

Table 17.2.1 Output Pins for CLKOUT and BCLK

PIN No.

Pin Name

Function

Set Value

P70/CLKOUT/WR#/BCLK

P70

P70MD=0

CLKOUT

P70MD=1, P70SMD=0, BUSMOD=0

WR#

P70MD=1, P70SMD=0, BUSMOD=1

BCLK

P70MD=1, P70SMD=1

133

P150/TIN0/CLKOUT/WR#

P150

P150MD=0

TIN0

P150MD=1, P150SMD=0

CLKOUT

P150MD=1, P150SMD=1, BUSMOD=0

WR#

P150MD=1, P150SMD=1, BUSMOD=1

20.1 Oscillator Circuit

Figure 20.1.5 A CLKOUT and BCLK Select Structure

SEL

PIN No. 133 output

P150

P150MD

SEL

TIN0

P150SMD

SEL

PIN No. 78 output

P70

P70MD

SEL

BCLK

P70SMD

SEL

CLKOUT

BUSMOD

WR#

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