HD404364 데이터 시트보기 (PDF) - Renesas Electronics

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HD404364

4-bit HMCS400-Series microcomputer

Renesas Electronics 

HD404369 Series

frame timing, but it is regarded as input synchronously with the second interrupt strobe clock after the

falling edge. An overflow and interrupt request in timer A is generated synchronously with the interrupt

strobe timing.

Active mode

Watch mode

Oscillation

stabilization period

Active mode

Interrupt strobe

INT0

Interrupt request

generation

(During the transition

T

from watch mode to

active mode only)

T: Interrupt frame length

tRC : Oscillation stabilization period

T

tRC

TX

T + tRC ≤ TX ≤ 2T + tRC

Figure 14 Interrupt Frame

Direct Transition from Subactive Mode to Active Mode: Available by controlling the direct transfer on

flag (DTON: $020, bit 3) and the low speed on flag (LSON: $020, bit 0). The procedures are described

below:

• Set LSON to 0 and DTON to 1 in subactive mode.

• Execute the STOP or SBY instruction.

• The MCU automatically enters active mode from subactive mode after waiting for the MCU internal

processing time and oscillation stabilization time (figure 16).

Notes: 1. The DTON flag ($020, bit 3) can be set only in subactive mode. It is always reset in active

mode.

2. The transition time (TD) from subactive mode to active mode:

tRC < TD < T + tRC

32

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