HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 164

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Bit 3
BRLE
0
1
Bits 2 to 0—Reserved: These bits cannot be modified and are always read as 1.
9.2.3 Pin Functions in Each Mode
Port 1 operates differently in the expanded modes (modes 1, 2, 3, and 4) and the single-chip mode
(mode 7). Table 9-3 explains how the pin functions are selected in the expanded mode. Table 9-4
explains how the pin functions are selected in the single-chip mode.
Table 9-3 Port 1 Pin Functions in Expanded Modes
Pin
P1
P1
ADTRG
When used for P1
P1
7
6
5
/ TMO The function depends on output select bits 3 to 0 (OS3 to OS0) of the 8-bit timer
/ IRQ
/ IRQ
1
0
/ The function depends on the IRQ
Description
P1
P1
Selection of Pin Functions
control/status register (TCSR) and on the P1
OS3 to OS0
P1
Pin function
in the A/D control register (ADCR) as follows:
IRQ
TRGE
Pin function
The function depends on the IRQ
IRQ
P1
Pin function
3
3
7
5
and P1
functions as the BREQ input pin. P1
DDR
DDR
1
0
E
E
6
input/output, the input or output function is selected by P1
2
function as input/output pins.
P1
P1
P1
output
6
7
5
All four bits are 0
0
0
0
input/
input
input
0
0
P1
P1
ADTRG
7
5
input
output
output
1
1
1
1
0
E bit and the trigger enable bit (TRGE)
E bit and the P1
147
2
functions as the BACK output pin.
IRQ
7
At least one bit is 1
DDR bit as follows:
1
0
0
0
input
TMO output
IRQ
5
DDR bit as follows:
0
1
1
input
IRQ
ADTRG
input
1
1
1
1
and
6
DDR.
(Initial value)