NEC UPD789026 Series 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.
Symbol
INTM0 ES21
ES21
ES11
ES01
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Cautions 1. Be sure to set bits 0 and 1 to 0.
CHAPTER 10 INTERRUPT FUNCTIONS
Figure 10-4. External Interrupt Mode Register 0 Format
7 6 5
ES20 ES11 ES10
ES20
0 0 Falling edge
0 1
Rising edge
1 0 Setting prohibited
Both rising and falling edges
1 1
ES10
0 0
Falling edge
0 1
Rising edge
1 0 Setting prohibited
Both rising and falling edges
1 1
ES00
0 0
Falling edge
0 1
Rising edge
Setting prohibited
1 0
Both rising and falling edges
1 1
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 ××
(××
××IF× × × × = 0), then clear the interrupt mask flag (××
×× ××
request flag (××
interrupts.
'
4 3 2
ES01 ES00
INTP2 Valid Edge Selection
INTP1 Valid Edge Selection
INTP0 Valid Edge Selection
User's Manual U11919EJ3V0UM00
Address
1 0
0 0 FFECH
××MK× × × × = 0) to enable
×× ××
After Reset
R/W
00H R/W
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