UPD753012GC NEC, UPD753012GC Datasheet - Page 38

• Manufacturer Part Number: UPD753012GC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

8. STANDBY FUNCTION
mode and HALT mode) are provided for the PD753017.
Notes 1.
38
Set instruction
System clock when set
Operation
status
Release signal
In order to save power consumption while a program is in a standby mode, two types of standby modes (STOP
2.
Cannot operate only when the main system clock stops.
Can operate only when the noise eliminator is not used (IM02 = 1) by bit 2 of the edge detection mode
register(IM0).
Clock generator
Basic interval timer
Serial interface
Timer/event counter
Watch timer
LCD controller/driver
External interrupt
CPU
Table 8-1. Operation Status in Standby Mode
STOP instruction
Settable only when the main system
clock is used.
Only the main system clock stops
oscillation.
Operation stops
Operable only when an external SCK
input is selected as the serial clock.
Operable only when a signal input to
the TI0-TI2 pins is specified as the
count clock.
Operable when f
count clock.
Operable only when f
the LCDCL.
The INT1, 2, and 4 are operable.
Only the INT0 is not operated.
The operation stops.
Interrupt request signal sent from the operable hardware enabled by the
interrupt enable flag or RESET signal input.
STOP Mode
XT
is selected as the
XT
is selected as
Note 2
HALT instruction
Settable both by the main system
clock and subsystem clock.
Only the CPU
continues).
Operation.
Operable
Operable
Operable
Operable
PD753012, 753016, 753017
BT mode : Sets IRQBT at reference
WT mode: Generates reset signal
Note 1
Note 1
Note 1
time intervals.
when BT overflows.
HALT Mode
halts (oscillation