em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 54

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
44 •
6.2.5 IOC7 (I/O Port 7 Control Register)
Bits 7 ~ 2 (C77 ~ C72): 6-bit Port7 I/O data register
Bits 1 ~ 0:
You can use IOC7 register to define each bit as input or output.
6.2.6 IOC8 (I/O Port 8 Control Register)
Bits 7 ~ 4:
Bit 3 ~ 0 (C83 ~ C80): 4-bit Port8 I/O data register
You can use IOC8 register to define each bit as input or output.
6.2.7 IOC9
Reserved registers
6.2.8 IOCA (WDT Control Register)
Bit 7 (WDTE): Control bit used to enable the Watchdog timer
WDTE
Bit 7
Bit 7
Bit 7
C77
-
For F642/542N, Bit 6 ~ Bit 5, Bit 3 ~ Bit 0 are unused. Set to “0” all the time.
For F641/541N, Bit 7 ~ Bit 0 are unused. Set to “0” all the time.
Bit 6
Bit 6
Bit 6
0: Define I/O pin as output
1: Define I/O pin as high impedance
Not used, set to “0” all the time.
Not used, set to “0” all the time.
0: Define I/O pin as output
1: Define I/O pin as high impedance
C76
EIS
0: Disable WDT
1: Enable WDT
WDTE is both readable and writable.
-
For F644N, Bit 3 is unused. Set to “0” all the time.
Bit 5
Bit 5
Bit 5
C75
-
-
Bit 4
Bit 4
Bit 4
C74
(This specification is subject to change without further notice)
-
-
NOTE
NOTE
PSWE
Bit 3
Bit 3
Bit 3
C83
C73
Product Specification (V1.0) 05.05.2010
PSW2
Bit 2
Bit 2
Bit 2
C72
C82
PSW1
Bit 1
Bit 1
Bit 1
C81
-
PSW0
Bit 0
Bit 0
Bit 0
C80
-