UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 100

• 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

8.3
100
(1) Interrupt request flag register 0 (IF0)
Address: FFE0H
Symbol
INTLVI
INTP0
INTP1
INTTMH1
IF0
The interrupt functions are controlled by the following four types of registers.
• Interrupt request flag register 0 (IF0)
• Interrupt mask flag register 0 (MK0)
• External interrupt mode register 0 (INTM0)
• Program status word (PSW)
Table 8-2 lists interrupt requests, the corresponding interrupt request flags, and interrupt mask flags.
Interrupt Function Control Registers
An interrupt request flag is set to 1 when the corresponding interrupt request is issued, or when the
instruction is executed.
acknowledged or when a reset signal is input.
IF0 is set with a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears IF0 to 00H.
Interrupt Request Signal
Caution Because P21 and P32 have an alternate function as external interrupt inputs, when the
0
1
7
0
IF
After reset: 00H
output level is changed by specifying the output mode of the port function, an interrupt
request flag is set. Therefore, the interrupt mask flag should be set to 1 before using the
output mode.
No interrupt request signal has been issued.
An interrupt request signal has been issued; an interrupt request status.
6
0
Table 8-2. Interrupt Request Signals and Corresponding Flags
Figure 8-2. Format of Interrupt Request Flag Register 0 (IF0)
5
0
It is cleared to 0 by executing an instruction when the interrupt request is
R/W
CHAPTER 8 INTERRUPT FUNCTIONS
LVIIF
PIF0
PIF1
TMIFH1
Preliminary User’s Manual U18681EJ1V0UD
TMIFH1
<4>
Interrupt Request Flag
PIF1
<3>
Interrupt request flag
PIF0
<2>
LVIIF
<1>
LVIMK
PMK0
PMK1
TMMKH1
0
0
Interrupt Mask Flag