UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 234

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

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(2) HALT mode release
The HALT mode can be released by the following two sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the HALT mode is released. If interrupt
acknowledgment is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgment is
disabled, the next address instruction is executed.
Remarks 1. The broken lines indicate the case when the interrupt request which has released the
Status of CPU
release signal
System clock
oscillation
Standby
2. The wait time is as follows:
Figure 13-2. HALT Mode Release by Interrupt Request Generation
standby mode is acknowledged.
• When vectored interrupt servicing is carried out: 11 to 13 clocks
• When vectored interrupt servicing is not carried out: 3 to 5 clocks
Operating mode
instruction
HALT
CHAPTER 13 STANDBY FUNCTION
User’s Manual U16898EJ5V0UD
HALT mode
Interrupt
request
Oscillation
Wait
Wait
Operating mode