HD6475348R Datasheet, PDF (164/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Bit 3
BRLE
0
1
Description
P13 and P12 function as input/output pins.
(Initial value)
P13 functions as the BREQ input pin. P12 functions as the BACK output pin.
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
Selection of Pin Functions
P17 / TMO The function depends on output select bits 3 to 0 (OS3 to OS0) of the 8-bit timer
control/status register (TCSR) and on the P17DDR bit as follows:
OS3 to OS0
P17DDR
Pin function
All four bits are 0
0
1
P17 input P17 output
At least one bit is 1
0
1
TMO output
P16 / IRQ1 / The function depends on the IRQ1E bit and the trigger enable bit (TRGE)
ADTRG in the A/D control register (ADCR) as follows:
IRQ1E
0
1
TRGE
0
1
0
1
Pin function P16 input/ ADTRG IRQ1 input IRQ1 and
output
input
ADTRG
input
When used for P16 input/output, the input or output function is selected by P16DDR.
P15 / IRQ0 The function depends on the IRQ0E bit and the P15DDR bit as follows:
IRQ0E
P15DDR
Pin function
0
0
1
P15 input P15 output
1
0
1
IRQ0 input
147