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MB95630H Series
13.4
Operation
The interrupt pins are selected by setting the WICR register.
■ Operation of Interrupt Pin Selection Circuit
The WICR register selects the input pins to be input to INT00 of the external interrupt circuit
(ch. 0). Below is a setup procedure for the interrupt pin selection circuit and external interrupt
circuit (ch. 0), which must be followed when selecting the TRG1 pin as an interrupt pin.
1. Write "0" to the corresponding bit in the port direction register (DDR) to set the pin as an
input.
2. Select the TRG1 pin as an interrupt input pin in the WICR register.
- Write "0x01" to the WICR register. At this point, write "0" to the EIE0 bit in the EIC00
register of the external interrupt circuit to disable the operation of the external interrupt
circuit.
3. Enable the operation of INT00 of the external interrupt circuit (ch. 0).
- Set the SL0[1:0] bits in the EIC00 register to any value other than "0b00" in the external
interrupt circuit to select the valid edge. Also write "1" to the EIE0 bit to enable
interrupts.
4. The subsequent interrupt operation is the same as that of the external interrupt circuit.
- When a reset is released, the WICR register is initialized to "0x40" and the INT00 bit is
selected as the only available interrupt pin. To use any pins other than the INT00 pin as
external interrupt pins, modify the settings of this register before enabling the operation
of the external interrupt circuit.
MN702-00009-1v0-E
CHAPTER 13 INTERRUPT PIN SELECTION CIRCUIT
FUJITSU SEMICONDUCTOR LIMITED
13.4 Operation
191
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