M16C6K7 Datasheet, PDF (169/285 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Rev.1.0
Serial Interrupt Output
Mitsubishi microcomputers
M16C / 6K7 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
q Serial interrupt control register1 SERCON1
The register is for setting the pins of serial interrupt.
•Reset selection bit RSEL
__________
0: The input of PRST is the reset signal.
______________
1: The input of LRESET is the reset signal. (Note1)
__________
Note 1: The PRST pin becomes I/O port if setting the bit to “1”.
•OBF0 mergence function
By setting the bit to “1”, the signal, which is logically OR by OBF00 and OBF01 signals from LPC
bus interface, will output to IRQ1 and IRQ12 of serial interrupt circuit.
Fig.SI-6 shows the selection circuit controlled by the bit.
With the function, the IRQ1 and IRQ12 request bits can be cleared simultaneously by H/W at the
read of output data buffer from system if both IRQ1 and IRQ12 request bits are set in the case
that IRQ1 request bit (or IRQ12 request bit) is set after that of IRQ12 (or IRQ1) because of the
overwrite to the output data buffer.
Serial interrupt control register 1
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
SERCON1
Bit symbol
Reserved bit
Address
02B116
Bit symbol
When reset
0016
Function
Must be “0”.
RSEL
Reset selection bit
Reserved bit
0 : Select PRST pin.
1 : Select LRESET pin.
Must be “0”.
OBF0MRG OBF0 mergence bit
Nothing is allocated.
Meaningless in writing. “0” in reading.
0 : OBF00 and OBF01 are
independent.
1 : OBF00 and OBF01 are
merged (logical OR).
RW
Fig.SI-5 Configuration of serial interrupt control register1
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