Rev. 1.0, 09/02, page 133 of 568
Table 9.17 P30 Pin Function
TE in SCR_0
0
1
P30DDR 0
1
Pin function
P30 input
P30 output
TxD0 output
Note:
*
When used as an external interrupt input pin, do not use as an I/O pin for another function.
9.3 Port
4
Port 4 is an input-only port. Port 4 pins also function as A/D converter analog input pins. Port 4
has the following register.
•
Port 4 register (PORT4)
9.3.1
Port 4 Register (PORT4)
PORT4 is an 8-bit read-only register that shows port 4 pin states.
Bit
Bit Name
Initial Value
R/W
Description
7 P47
Undefined
*
R
6 P46
Undefined
*
R
5 P45
Undefined
*
R
4 P44
Undefined
*
R
3 P43
Undefined
*
R
2 P42
Undefined
*
R
1 P41
Undefined
*
R
0 P40
Undefined
*
R
The pin states are always read when a port 4 read is
performed.
Note:
*
Determined by the states of pins P47 to P40.
9.4 Port
7
Port 7 is an 8-bit I/O port and has the following registers.
•
Port 7 data direction register (P7DDR)
•
Port 7 data register (P7DR)
•
Port 7 register (PORT7)
Содержание H8S/2627
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