EM78P809N
8-Bit Microcontroller
•
IOC6 ~ IOC9 − I/O Port Control Register
ꢂ
"1" puts the relative I/O pin into high impedance, while "0" defines the relative
I/O pin as output.
ꢂ
IOC6 and IOC9 registers are both readable and writable.
•
INTCR − INT Control Register ( Address : 0Bh )
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INT1NR
INT0EN
0
INT3ES1 INT3ES0
0
INT1ES
TC2ES
Bit 7 ( INT1NR ) : INT1 noise reject time select
INT1NR = “0” : Pulses less than 63/fc are eliminated as noise
INT1NR = “1” : Pulses less than 15/fc are eliminated as noise
Bit 6 ( INT0EN ) : INT0 enable control
INT0EN = “0” : General I/O
INT0EN = “1” : /INT0 pin
Bit 5 : Reserved
Bit 4 ~ Bit 3 ( INT3ES1 ~ INT3ES0) : INT3 edge select
INT3ES1
INT3ES0
Edge Select
0
0
1
1
0
1
0
1
Rising
Falling
Both edge
Reserved
Bit 2 : Reserved
Bit 1 ( INT1ES ) : INT1 edge select
INT1ES = “0” : Rising edge
INT1ES = “1” : Falling edge
Bit 0 (TC2ES) : Timer/Counter 2 edge select.
TC2ES = “0” : Rising edge
TC2ES = “1” : Falling edge
24 •
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
