NEC PD754144 User Manual page 225

(2) Application example of HALT mode (when using the µ PD754244 at f
<To perform intermittent operation under the following conditions>
• The standby mode is set at the falling edge of INT0 and released at the rising edge.
• In the standby mode, an intermittent operation is performed at intervals of 175 ms (INTBT).
• INT0 and INTBT are assigned a lower priority.
• The slowest CPU clock is selected in the standby mode.
<Timing chart>
V
DD
V pin voltage
DD
0 V
P61/INT0
Operation
mode
CPU operation
CHAPTER 8 STANDBY FUNCTION
Intermittent operation
(HALT mode + Iow-speed operation)
INT0
User's Manual U10676EJ3V0UM
= 6.0 MHz)
X
Operation mode Operation mode
(low-speed) (high-speed)
175 ms
INT0
225