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

Section 5 Power-Down Modes
Operating
mode
φ or φ
SUB
External input signal
Capture possible:
case 1
Capture possible:
case 2
Capture possible:
case 3
Capture not
possible
Figure 5.3 External Input Signal Capture when Signal Changes before/after
4. Input pins to which these notes apply:
, ,
I R Q I R Q I R Q
4 3 1
5.4

Watch Mode

5.4.1

Transition to 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 is halted except for timer A, timer F,
timer G, AEC and the LCD controller/driver (for which operation or halting can be set) is halted.
As long as a minimum required voltage is applied, the contents of CPU registers, the on-chip
RAM and some registers of the on-chip peripheral modules, are retained. I/O ports keep the same
states as before the transition.
Rev. 7.00 Mar 10, 2005 page 132 of 652
REJ09B0042-0700
Active (high-speed,
medium-speed) mode
or subactive mode
t t
cyc cyc
t t
subcyc subcyc
Standby Mode or Watch Mode
, , to
I R Q W K P W K P
0 7
Wait for
Standby mode oscillation
or watch mode to settle
t
cyc
t
subcyc
Interrupt by different
signal
, IRQAEC, TMIC, TMIF, TMIG,
0
Active (high-speed,
medium-speed) mode
or subactive mode
t
cyc
t
subcyc
.
A D T R G