HD4043312 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD4043312

4-bit HMCS400-Series microcomputer

Hitachi -> Renesas Electronics 

HD404339 Series

System clock selection register 1 (SSR1: $027)

Bit

Initial value

Read/Write

Bit name

3

2

0

0

W

W

SSR13*1 SSR12

1

0

0

—

W

—

SSR11 Not used

SSR11

0

1

System Clock Selection*2

0.4 to 1.0 MHz

1.6 to 4.5 MHz

SSR12

0

1

32-kHz Oscillation Division

Ratio Selection

fSUB = fX/8

fSUB = fX/4

SSR13 32-kHz Oscillation Stop

0

Oscillation operates in stop mode

1

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.

*2 When the subsystem oscillator (32.768 kHz crystal oscillator) is used, set 0.4 MHz≤ fOSC ≤ 1.0MHz

or 1.6 MHz ≤ fOSC ≤ 4.5 MHz.

Figure 20 System Clock Selection Register 1 (SSR1)

System clock selection register 2 (SSR2: $028)

Bit

Initial value

Read/Write

Bit name

3

2

1

—

—

0

—

—

W

Not used Not used SSR21

0

0

W

SSR20

SSR21

0

0

1

1

SSR20

0

1

0

1

System Clock Division Ratio

1/4 division

1/8 division

1/16 division

1/32 division

Figure 21 System Clock Selection Register 2 (SSR2)

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