Datasheet

Section 10 I/O Ports
Page 570 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
10.4 Port 4
Port 4 is an 8-bit input-only port that also has other functions, such as analog input pins. Port 4 has
the following register.
• Port 4 register (PORT4)
10.4.1 Port 4 Register (PORT4)
PORT4 is an 8-bit read-only register that shows the pin states of port 4. PORT4 cannot be
modified.
Bit Bit Name Initial Value R/W Description
7 P47 ⎯* R
6 P46 ⎯* R
5 P45 ⎯* R
4 P44 ⎯* R
3 P43 ⎯* R
2 P42 ⎯* R
1 P41 ⎯* R
0 P40 ⎯* R
The pin states are always read from this register.
Note: * Determined by the states of pins P47 to P40.
10.4.2 Pin Functions
Port 4 also functions as the pins for A/D converter analog inputs and interrupt inputs (the
H8S/2454 Group). The correspondence between pins is as follows.
(1) Pin Functions of H8S/2456 Group and H8S/2456R Group
• P40/AN0_0, P41/AN1_0, P42/AN2_0, P43/AN3_0, P44/AN4_0, P45/AN5_0, P46/AN6_0,
P47/AN7_0
Pin function ANn_0 input
[Legend]
n = 7 to 0