upd75112 Renesas Electronics Corporation., upd75112 Datasheet - Page 11

• Manufacturer Part Number: upd75112
• Description: 4-bit Single Chip-microcomputer
• Manufacturer: Renesas Electronics Corporation.

3.4 Recommended Connection of Unused Pins
PTH00 to PTH03
TI0
TI1
P00
P01 to P03
P10 to P13
P20 to P23
P30 to P33
P40 to P43
P50 to P53
P60 to P63
P70 to P73
P80 to P83
P90 to P93
P120 to P123
P130 to P133
P140 to P143
RESET
NC
*1: Only when a power-on reset generator is built in by mask
2: When the PWB is shared with the PD75P116, connect the
option, connect t V
NC pin to V
Pin
DD
directly.
Recommended Connecting Method
Connect to V
Connect to V
Connect to V
Connect to V
Input state : Connect to V
Output state : Leave open
Connect to V
Leave open or connect to V
DD
.
SS
SS
SS
SS
DD
*1
or V
or V
DD
DD
SS
DD
*2
or V
DD
3.5 Caution Relating to Use of P00/INT4 Pin and RESET Pin
In addition to the functions described in sections 3.1
and 3.2, the P00/INT4 pin and the RESET pin have the
function to set the IC test mode for testing the PD75116
internal operations.
When a voltage larger than V
these two pins, the test mode is set. Thus, if noise
exceeding V
tions, the test mode is set and normal operations may
be discontinued.
For example, if a cable from the P00/INT4 or RESET pin
is too long, inter-wiring noise may be applied to the pin,
the pin voltage may become larger than V
malfunctioning.
Thus, carry out wiring to minimize inter-wiring noise. If
the noise cannot be suppressed completely, carry out
the following countermeasure against noise using an
externally mounted component.
o Connect a diode with low V
Diode with low V
o Connect acapacitor between V
DD
is applied even during normal opera-
F
P00/INT4, RESET
P00/INT4, RESET
F
PD75112, 75116
(max 0.3 V)between V
DD
DD
is applied to one of
s
V
V
DD
DD
V
V
DD
DD
DD
, causing
DD
11
s