參數(shù)資料
型號(hào)： UPD78218ACW
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁(yè)數(shù)： 13/66頁(yè)
文件大小： 510K
代理商： UPD78218ACW
13
μ
PD78217A, 78218A
2.3
PIN I/O CIRCUITS AND UNUSED PIN CONNECTION
The input/output circuit type of each pin and recommended connection of unused pins are shown in Table 2-1.
For the input/output circuit configuration of each type, see Fig. 2-1.
Table 2-1 Input/Output Circuit Type of Each Pin
4
2
2-A
5-A
8-A
10-A
5-A
4
5-A
11
9
4
2
1
Leave open.
Connected to V
DD
or V
SS
.
Connected to V
DD
.
Input
: Connected to V
DD
.
Output
: Leave open.
Leave open.
Input
: Connected to V
DD
.
Output
: Leave open.
Input
: Connected to V
DD
.
Note
Output
: Leave open.
Connected to V
SS
.
Leave open.
Connected to V
SS
or V
DD
.
Note
Connected to V
SS
.
Input/Output
Circuit Type
Output
Input
Input/output
Output
Input/output
Input
Output
Input
P00 to P07
P20/NMI
P21/INTP0
P22/INTP1
P23/INTP2/CI
P24/INTP3
P25/INTP4/ASCK
P26/INTP5
P27/SI
P30/R
X
D
P31/T
X
D
P32/SCK
P33/SB0/SO
P34/TO0 to P37/TO3
P40/AD0 to P47/AD7
P50/A8 to P57/A15
P60/A16 to P63/A19
P64/RD
P65/WR
P66/WAIT/AN6
P67/REFRQ/AN7
P70/AN0 to P75/AN5
ASTB
RESET
EA
AV
REF
AV
SS
Unused Pin Connection
Pin Name
I/O
Caution
If the input/output mode is undefined for the input/output dual-function pins, connect these pins to
V
DD
via a resistor of several ten k
.
(Especially if the reset input pin exceeds the low-level input voltage at power-on or in case of input/
output switching by software.)
Remark
The type numbers are standardized for 78K series, therefore they are not always consecutive numbers
for each product (some circuits are not incorporated).
Note
A voltage outside the range AV
SS
to AV
REF
should not be applied, as this may damage the
μ
PD78217A/78218A.
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