HD404639R Datasheet, PDF (45/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

D₄–D₁₁, R port
V_CC
V_CC
Pull-up
MOS
HD404639R Series
Pull-up control signal
HLT
MIS3
Buffer control signal
DCD, DCR
Output data
PDR
Input data
Input control signal
Figure 27-1 I/O Buffer Configuration (with Pull-Up MOS)
Table 21-2 Programmable I/O Circuits (with Pull-Down MOS)
MIS3 (Bit 3 of MIS)
0
1
DCD, DCR
0
1
0
1
PDR
0
1
0
1
0
1
0
1
CMOS buffer PMOS —
—
—
On
—
—
—
On
NMOS —
—
On
—
—
—
On
—
Pull-down MOS
—
—
—
—
On
—
On
—
Note: — indicates off status.
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