M16C6K9 Datasheet, PDF (174/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Serial Interrupt Output
q Serial interrupt control register2 SERCON2
The polarity of serial interrupt output can be selected by bit 0 to bit 5 of serial interrupt control register 2.
When the bit is set to “0”:
If there is a request, Hiz-Hiz-Hiz
If there is no request, L-H-Hiz
When the bit is set to “1”:
If there is a request, L-H-Hiz
If there is no request, Hiz-Hiz-Hiz
Only the default value of bit 4 (serial interrupt polarity bit 3) of serial interrupt control register 2
after reset is “1”.
Fig.SI-7 shows the configuration of serial interrupt control register 2.
Serial interrupt control register 2
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
SERCON2
Address
02B716
When reset
1016
Bit symbol
Bit name
SERSEL00 Serial interrupt polarity selection
bit 00
SERSEL01 Serial interrupt polarity selection
bit 01
SERSEL1 Serial interrupt polarity selection
bit 1
SERSEL2 ^{Serial interrupt polarity selection}
bit 2
SERSEL3
SERSEL4
Serial interrupt polarity selection
bit 3
Serial interrupt polarity selection
bit 4
Function
Select serial interrupt
output polarity of IRQ1 in
channel 0. (Note)
Select serial interrupt
output polarity of IRQ12
in channel 0. (Note)
Select serial interrupt
output polarity of IRQ in
channel 1. (Note)
Select serial interrupt
output polarity of IRQ in
channel 2. (Note)
Select serial interrupt
output polarity of IRQ in
channel 3. (Note)
Select serial interrupt
output polarity of IRQ in
channel 4. (Note)
RW
Nothing is assigned.
Meaningless in writing. “0” in reading.
Note: “0”
“1”
: If there is a request
If there is no request
: If there is a request
If there is no request
Hiz-Hiz-Hiz
L-H-Hiz
L-H-Hiz
Hiz-Hiz-Hiz
Fig.SI-7 The configuration of serial interrupt control register 2
Rev.1.00 Jun 06, 2003 page 174 of 290