µPD75304B,75306B,75308B
7. STANDBY FUNCTION
To reduce the power consumption during program wait, the µPD75308B has two standby modes: STOP
mode and HALT mode.
Table 7-1 Operation Status at Standby Mode
STOP Mode
STOP instruction
HALT Mode
HALT instruction
Setting instruction
Main system clock or subsystem
clock settable
Only main system clock settable
System clock at setting
Only main system clock oscillation
stopped
Only CPU clock Φ stopped
Clock oscillator
(oscillation continued)
Operating (IRQBT set at reference time
Basic interval timer
Stopped
intervals)*
Operable only when external SCK
input selected as serial clock
Operable*
Operable*
Serial interface
Operable only when TI0 pin input
specified as count clock
Timer/event counter
Operable only when fXT selected as
count clock
Operable
Operable
Watch timer
Operable only when fXT selected as
LCDCL
LCD controller
INT1, 2, 4: Operable
Only INT0 inoperable
External interrupt
CPU
Stopped
Interrupt request signal from operable
hardware enabled by interrupt enable
flag, or RESET input
Interrupt request signal from operable
hardware enabled by interrupt enable
flag, or RESET input
Release signal
*
In-operable only with main system clock oscillation stopped.
34
NEC [ NEC ]
