PD64A_15 Datasheet, PDF (16/66 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR INFRARED REMOTE CONTROL TRANSMISSION

µPD64A, 65
3. PORT REGISTERS (PX)
The KI/O port, the KI port, the special ports (S0, S1/LED, S2), and the control registers are treated as port registers.
Port register values after reset are shown below.
Figure 3-1. Port Register Configuration
KI/O7
KI3
0
0
Port register
After reset
P0
FFH
P10
P00
KI/O6
KI/O5
KI/O4
KI/O3
P1
KI/O2
KI/O1
KI/O0
×FH^Note
P11
P01
KI2
KI1
KI0
S1/LED
S0
S2
1
P3 (control register 0)
03H
P13
P03
DP10
DP9
DP8
TCTL CARY MOD1 MOD0
P4 (control register 1)
26H
P14
P04
0
KI
pull-down
S0/S1
pull-down
S2
S1/LED mode KI/O mode
STOP release
S0 mode
Note ×: Value based on the KI pin state
Table 3-1. Relationship Between Ports and Read/Write
Port Name
KI/O
KI
S0
S1/LED
S2
Input Mode
Read
Write
Pin state
Output latch
Pin state
—
Pin state
—
Pin state
—
Pin state
—
Output Mode
Read
Write
Output latch Output latch
—
—
Note
—
Pin state
—
—
—
Note When in OFF mode, “1” is always read.
14
Data Sheet U14380EJ3V0DS00