UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 229

• 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

The vector interrupt enable state is set for INTP0, INTP1, and INTTMH1.
(Interrupt priority INTP0 > INTP1 > INTTMH1 (refer to Table12-1))
INTP0 interrupt was first masked.
performed.
12.4.3 Interrupt request pending
execution of the next instruction even if the interrupt request (maskable interrupt and external interrupt) is generated
during the execution. The following shows such instructions (interrupt request pending instruction).
In the interrupt INTTMH1 servicing, servicing is performed such that the INTP1 interrupt is given priority, since the
Afterwards, once the interrupt mask for INTP0 is released, INTP0 processing through multiple interrupts is
IE = 0: Interrupt request acknowledgment disabled
Some instructions may keep pending the acknowledgment of an instruction request until the completion of the
• Manipulation instruction for interrupt request flag registers (IF0, IF1)
• Manipulation instruction for interrupt mask flag registers (MK0, MK1)
INTTMH1
Main processing
Example 3. A priority is controlled by the multiple interrupts
EI
Figure 12-10. Example of Multiple Interrupts (2/2)
IE = 0
CHAPTER 12 INTERRUPT FUNCTIONS
User’s Manual U16898EJ5V0UD
INTP0
INTP1
INTTNH1 servicing
PMK0 = 1
PMK0 = 0
RETI
EI
IE = 0
IE = 0
INTP1 servicing
INTP0 servicing
RETI
RETI
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