Watch Mode; Transition To Watch Mode - Renesas F-ZTAT H8 Series Hardware Manual

8-bit single-chip microcomputer

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External input signal

Capture possible:

Capture possible:

Capture possible:

Figure 5.3 External Input Signal Capture when Signal Changes before/after

4. Input pins to which these notes apply:

Note: * H8/3857 Group pin, not provided in the H8/3854 Group.

Watch Mode

The system goes from active or subactive mode to watch mode when a SLEEP instruction is

executed while the SSBY bit in SYSCR1 is set to 1 and bit TMA3 in TMA is set to 1.

In watch mode, operation of on-chip peripheral modules other than timer A and the LCD

controller is halted. The LCD controller can be selected to operate or to halt. As long as a

minimum required voltage is applied, the contents of CPU registers and some registers of the on-

chip peripheral modules, and the on-chip RAM contents, are retained. I/O ports keep the same

states as before the transition.

Active (high-speed,

medium-speed) mode

or subactive mode

Standby Mode or Watch Mode

Standby mode

or watch mode

Interrupt by different

, ADTRG, TMIB, TMIC*, TMIF

Rev.3.00 Jul. 19, 2007 page 111 of 532

5. Power-Down Modes

Active (high-speed,

medium-speed) mode

or subactive mode

REJ09B0397-0300