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

The MCU automatically provides an oscillation stabilization period tRC when operation switches from

watch mode to active mode. The interrupt frame period T and one of three values for tRC can be selected

with the miscellaneous register (MIS: $00C), as listed in figure 14.

Operation can switch directly from subactive mode to active mode, as illustrated in figure 15. In this case,

the transition time TD obeys the following relationship.

tRC < TD < T + tRC

Miscellaneous register (MIS: $00C)

Bit

Initial value

Read/Write

Bit name

3

0

W

MIS3

2

0

W

MIS2

1

0

W

MIS1

0

0

W

MIS0

MIS3 MIS2

Buffer control.

Refer to figure 24.

MIS1

0

0

1

1

MIS0

0

1

0

1

T*1

tRC*1

Oscillation Circuit Conditions

0.24414 ms 0.12207 ms External clock input

0.24414 ms*2

15.625 ms 7.8125 ms Ceramic oscillator

125 ms

62.5 ms

Crystal oscillator

Not used

—

Notes: 1. The values of T and tRC are applied when a 32.768-kHz crystal oscillator is used.

2. The value is applied only when direct transfer operation is used.

Figure 14 Miscellaneous Register

22

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