M16C6K9 Datasheet, PDF (64/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Interrupt
P140
P141
P140 request
P141 request
(Note 1)
Interrupt request bit
P140 event data
P141 event data
(Note 2)
P14 event register
0016
0116
0316
0016
The read signal from 02F616
The read from 02F616
0116
Interrupt
procession
0316
Interrupt
procession
0016
Interrupt
procession
Note 1: If there are several effective edge inputs, the input sequential order can not be confirmed.
Note 2: If another interrupt request occurs between the setting of prior key input interrupt 1 request bit and the read of
P14 event register, the interrupt request bit will be set again same as P14 event register. After the read of P14
event register, both the bits, which were set to “1”, will be automatically cleared. However, the interrupt processing
will be executed twice because of the re-setting of interrupt request bit (the value of P14 event register in the 2nd
reading will be “0”).
Fig.DD-19 The timing of key input interrupt 1
Rev.1.00 Jun 06, 2003 page 64 of 290