HD6432670 Hitachi, HD6432670 Datasheet - Page 493

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

The pin function is switched as shown below according to the combination of bit TE in SCR of
SCI_0 and bit P30DDR.
TE
P30DDR
Pin function
Note: NMOS open-drain output when P30ODR = 1.
10.4
Port 4 is an 8-bit input-only port. Port 4 has the following register.
10.4.1
PORT4 is an 8-bit read-only register that shows port 4 pin states.
PORT4 cannot be modified.
Bit
7
6
5
4
3
2
1
0
Note: Determined by the states of pins P47 to P40.
10.4.2
Port 4 also functions as the A/D converter analog input and D/A converter analog output. The
correspondence between pins are as follows.
P30/TxD0/IrTxD
Port 4 register (PORT4)
P47/AN7/DA1
Bit Name
P47
P46
P45
P44
P43
P42
P41
P40
Port 4
Port 4 Register (PORT4)
Pin Functions
Initial Value
Undefined*
Undefined*
Undefined*
Undefined*
Undefined*
Undefined*
Undefined*
Undefined*
P30 input
0
R/W
R
R
R
R
R
R
R
R
0
P30 output*
Description
The pin states are always read when a port 4 read is
performed.
1
RxD0/IrRxD
Rev. 2.0, 04/02, page 447 of 906
output*
—
1