NEC mPD789026 Subseries User Manual page 155

(3) External interrupt mode register 0 (INTM0)
This register is used to set the valid edge of INTP0 to INTP2.
INTM0 is set with an 8-bit memory manipulation instruction.
RESET input clears INTM0 to 00H.
7 6
Symbol
INTM0 ES21 ES20
ES21 ES20
0 0
0 1
1 0
1 1
ES11 ES10
0 0
0 1
1 0
1 1
ES00
ES01
0 0
0 1
1 0
1 1
Cautions 1. Be sure to set bits 0 and 1 to 0.
2. Before setting INTM0 register, be sure to set the corresponding interrupt mask flag
××MK× × × × = 1) to disable interrupts. After setting INTM0 register, clear the interrupt ×× ××
(××
request flag (××
interrupts.
CHAPTER 10 INTERRUPT FUNCTIONS
Figure 10-4. External Interrupt Mode Register 0 Format
5 4 3
ES11 ES10 ES01
Falling edge
Rising edge
Setting prohibited
Both rising and falling edges
Falling edge
Rising edge
Setting prohibited
Both rising and falling edges
Falling edge
Rising edge
Setting prohibited
Both rising and falling edges
××IF× × × × = 0), then clear the interrupt mask flag (××
×× ××
User's Manual U11919EJ3V0UM00
'
2 1 0
ES00 0 0
INTP2 Valid Edge Selection
INTP1 Valid Edge Selection
INTP0 Valid Edge Selection
Address After Reset
R/W
FFECH 00H R/W
××MK× × × × = 0) to enable
×× ××
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