UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 107

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

9.1
9.1.1
available.
Notes 1.
Caution The LSRSTOP setting is valid only when “Can be stopped by software” is set for the low-speed
Remark LSRSTOP: Bit 0 of the low-speed internal oscillation mode register (LSRCM)
The standby function is designed to reduce the operating current of the system. The following two modes are
(1) HALT mode
Operation Mode
Reset
STOP
HALT
Standby Function and Configuration
HALT instruction execution sets the HALT mode. In the HALT mode, the CPU operation clock is stopped.
Oscillation of the system clock oscillator continues. If the low-speed internal oscillator is operating before the
HALT mode is set, oscillation of the clock of the low-speed internal oscillator continues (refer to Table 9-1.
Oscillation of the low-speed internal oscillation clock (whether it cannot be stopped or can be stopped by
software) is set by the option byte). In this mode, the operating current is not decreased as much as in the
STOP mode, but the HALT mode is effective for restarting operation immediately upon interrupt request
generation and frequently carrying out intermittent operations.
Standby function
2.
3.
internal oscillator by the option byte.
When “Cannot be stopped” is selected for low-speed internal oscillator by the option byte.
When it is selected that the low-speed internal oscillator “can be stopped by software”, oscillation of the
low-speed internal oscillator can be stopped by LSRSTOP.
If the operating clock of the watchdog timer is the low-speed internal oscillation clock, the watchdog
timer is stopped.
Status
Table 9-1. Relationship Between Operation Clocks in Each Operation Status
Stopped
Oscillating
Note 1
CHAPTER 9 STANDBY FUNCTION
Low-Speed Internal Oscillator
Preliminary User’s Manual U18681EJ1V0UD
Oscillating
LSRSTOP = 0
Note 3
Note 2
Stopped
LSRSTOP = 1
Stopped
Oscillating
System Clock
Stopped
Oscillating
Clock Supplied to
Peripheral
Hardware
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