UPD6600A NEC, UPD6600A Datasheet - Page 9

• Manufacturer Part Number: UPD6600A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

11. PIN FUNCTIONS
11.1
used as an 8-bit input pin. When the port is set for the input mode, all of these pins are pulled down to the V
inside the LSI.
11.2
This is the 8-bit I/O pin for key-scan output. When the control register (P
At reset (all cleared), the value of I/O mode and output latch becomes undefined.
When K
K
K
I/O
I/O
I/O
PIN (P
PULL-DOWN RESISTOR CONFIGURATION
Input/output selection
is set to the input mode, pull-down resistor R is turned on.
Output signal
0
)
Input signal
P
0
K
I/O7
K
I/O6
Figure 11-1. K
P
10
K
I/O5
K
I/O4
I/O
CMOS
Pin Organization
K
I/O3
R
K
I/O2
Pull-down resistor
N-ch
P
00
1
) is set for the input port, the port can be
K
I/O1
V
DD
P-ch
N-ch
Control register
V
K
I/O0
SS
(P )
1
PD6124A, 6600A
Pin
SS
level
9