HD404339FS datasheet(31/80 Pages) RENESAS

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HD404339 Series

Bit

Initial value

Read/Write

Bit name

SSR13*1

SSR12

—

Not used

SSR11

System clock selection register 1 (SSR1: $027)

System Clock Selection*2

0.4 to 1.0 MHz

1.6 to 4.5 MHz

SSR11

SSR12

Ratio Selection

fSUB = fX/8

fSUB = fX/4

32-kHz Oscillation Division

SSR13

32-kHz Oscillation Stop

Oscillation operates in stop mode

Oscillation stops in stop mode

Notes: *1

SSR13 will only be cleared to 0 by a

RESET input. A STOPC input during stop mode will not

clear SSR13. Also note that SSR13 will not be cleared upon transition to stop mode.

When the subsystem oscillator (32.768 kHz crystal oscillator) is used, set 0.4 MHz

≤ f

OSC ≤ 1.0MHz

or 1.6 MHz

≤ f

OSC ≤ 4.5 MHz.

Figure 20 System Clock Selection Register 1 (SSR1)

Bit

Initial value

Read/Write

Bit name

—

Not used

—

Not used

SSR20

SSR21

System clock selection register 2 (SSR2: $028)

SSR21

SSR20

System Clock Division Ratio

1/4 division

1/8 division

1/16 division

1/32 division

Figure 21

System Clock Selection Register 2 (SSR2)

HD404339FS Datasheet(PDF) 31 Page - Renesas Technology Corp

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