Format Of External Interrupt Mode Register - NEC mPD780208 Subseries User Manual

(5) External interrupt mode register (INTM0)
This register is used to set the INTP0 to INTP2 and TI0 valid edges.
INTM0 is set with an 8-bit memory manipulation instruction.
RESET input sets INTM0 to 00H.
Remarks 1. The INTP0 pin is also used as TI0/P00.
2. The valid edge of INTP3 is fixed to the falling edge.
Symbol 7 6
INTM0 ES31 ES30
Caution When using the INTP0/TI0/P00 pin as a timer input pin (TI0), stop the operation of the 16-bit
timer by clearing bits 1 to 3 (TMC01 to TMC03) of the 16-bit timer mode control register (TMC0)
to 0, 0, 0, before setting the valid edge of TI0. When using the INTP0/TI0/P00 pin as an external
interrupt input pin (INTP0), the valid edge of INTP0 may be set while the 16-bit timer is
operating.
CHAPTER 6 16-BIT TIMER/EVENT COUNTER
Figure 6-8. Format of External Interrupt Mode Register
5 4 3 2
ES21 ES20 ES11 ES10
User's Manual U11302EJ4V0UM
1 0 Address
0 0 FFECH
ES11 ES10 INTP0/TI0 valid edge selection
0 0 Falling edge
0 1 Rising edge
1 0 Setting prohibited
1 1 Both falling and rising edges
INTP1 valid edge selection
ES21 ES20
0 0 Falling edge
0 1 Rising edge
1 0 Setting prohibited
1 1 Both falling and rising edges
INTP2 valid edge selection
ES31 ES30
0 0 Falling edge
0 1 Rising edge
1 0 Setting prohibited
1 1 Both falling and rising edges
After reset R/W
00H R/W
133