EM78P5840N/41N/42N
8-Bit Microcontrollers
7.3.4 IOC7 (Port 7 I/O Control, Port 7 Pull-high Control)
Page 0 (Port 7 I/O Control Register)
Bit 7
Bit 6
IOC76
R/W-1
Bit 5
IOC75
R/W-1
Bit 4
IOC74
R/W-1
Bit 3
IOC73
R/W-1
Bit 2
Bit 1
Bit 0
IOC70
R/W-1
0
-
0
-
0
-
Bit 0 (IOC70): Port 70 pin is defined as general purpose IO, PLLC, or OSC through
code option setting. In IRC mode or Crystal mode (only at code option
P70S =0 ), Port 70 pin is a general purpose IO, while IOC70 is I/O
direction control register of Port 70 pin.
"0" : Set the corresponding I/O pin as output
"1" : Set the corresponding I/O pin to high impedance
Bit 1 (undefined): This bit is not used. However, by setting P71S = 1 through code
option, Port 71 pin will become an input-only pin.
Bit 2 (undefined): This bit is not used but must be cleared to “0.” Otherwise, the MCU
power consumption will increase.
NOTE
The default value of this bit is “1.” Clear to “0” when initializing the MCU.
Bit 3 ~ Bit6 (IOC73~IOC76): Port 7 I/O direction control register
"0" : Set the corresponding I/O pin as output
"1" : Set the corresponding I/O pin to high impedance
Bit 7 (undefined): This bit is not used but must be cleared to “0.” Otherwise, the MCU
power consumption will increase.
NOTE
The default value of this bit is “1.” Clear to “0” when initializing the MCU.
Page 1 (Port 7 Pull-high Control Register)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
-
PH76
PH75
PH74
PH73
0
-
0
-
PH70
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
Bit 0 (PH70): Port 70 pull high control register. This bit only exists whe you set Port 70
as a general purpose IO.
"0" : disable pull high function
"1" : enable pull high function
Bits 1 ~ 2 & Bit 7 (undefined): These bits are not used but must be cleared to “0.”
Otherwise, the MCU power consumption will increase.
Bit 3 ~ Bit 6 (PH73 ~ PH76): Port 7 pull high control register
"0" : disable pull high function
"1" : enable pull high function
22 •
Product Specification (V1.0) 04.25.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
