UPD789304 Datasheet, PDF (29/64 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD789304, 789306, 789314, 789316
7. STANDBY FUNCTION
The following two standby modes are available for further reduction of system current consumption.
• HALT mode: In this mode, the CPU operation clock is stopped. The average current consumption can be
reduced by intermittent operation by combining this mode with the normal operation.
• STOP mode: In this mode, oscillation of the main system clock is stopped. All operations performed on the
main system clock are suspended resulting in extremely small power consumption.
Figure 7-1. Standby Function
System clock operation
Interrupt
request
STOP
HALT instruction
instruction
Interrupt
request
STOP mode
( Main system clock
oscillation stopped
HALT mode
( Clock supply to CPU
halted, oscillation
maintained
8. RESET FUNCTION
The following two reset methods are available.
• External reset by RESET pin
• Internal reset by watchdog timer program loop time detection
9. MASK OPTIONS
The µPD789304, 789306, 789314, and 789316 have the following mask options.
• Mask options for P50 to P53
An on-chip pull-up resistor can be selected.
<1> Specifies on-chip pull-up resistor in 1-bit units.
<2> Does not specify on-chip pull-up resistor.
Data Sheet U14384EJ1V0DS
29