SH7708 datasheet(188/633 Pages) RENESAS

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9.4

9.4.1

Frequency Control Register (FRQCR)

The frequency control register (FRQCR) is a 16-bit read/write register used to specify whether a

clock is output from the CKIO pin, the on/off state of PLL circuit 1, PLL standby, the frequency

multiplication ratio of PLL circuit 1, and the frequency division ratio of the internal clock and the

peripheral clock.

Only word access can be used on the FRQCR register. FRQCR is initialized to H'0102 by a

power-on reset, but retains its value in a manual reset and in standby mode.

SH7708, SH7708S:

Bit:

Bit name:

—

CKOEN

Initial value:

R/W:

R/W

Bit:

Bit name:

PLLEN

PSTBY

STC1

STC0

IFC1

IFC0

PFC1

PFC0

Initial value:

R/W:

R/W

Bit 8—Clock Enable (CKOEN): Used to output a clock from the CKIO pin or to fix the level of

the CKIO pin. Even when the level is fixed, the SH7708 Series will operate internally at the

frequency before the level was fixed. In case of clock operating mode 7, the CKIO pin becomes an

input pin irrespective of the value of this bit.

Bit 8: CKOEN

Description

Fixes the level of CKIO terminal.

Outputs a clock from the CKIO pin.

(Initial value)

SH7708 数据表(PDF) 188 Page - Renesas Technology Corp

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