參數資料
型號: HD404639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數: 41/133頁
文件大?。?/td> 803K
代理商: HD404639R
HD404639R Series
41
Circuit
Configuration
Circuit Constants
Crystal oscillator
(OSC
1
, OSC
2
)
C
1
2
C
Crystal
oscillator
GND
L
S
C
R
S
C
0
f
R
OSC
1
OSC
2
OSC
2
OSC
1
R
f
= 1 M
±
20%
C
= C
= 10–22 pF
±
20%
Crystal: Equivalent to circuit shown below
C
0
= 7 pF max
R
= 100
max
f = 400 kHz, 800 kHz, 2 MHz, 3.58 MHz, 4
MHz, 7.16 MHz, 8 MHz
Crystal oscillator
(X1, X2)
X1
C
1
2
C
X2
Crystal
oscillator
GND
L
S
C
R
S
C
0
X1
X2
Crystal: 32.768 kHz: MX38T (Nippon
Denpa)
C
1
= C
= 20 pF
±
20%
R
S
: 14 k
C
0
: 1.5 pF
Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator and stray
capacitance of the board, the user should consult with the crystal or ceramic oscillator
manufacturer to determine the circuit parameters.
2. Wiring among OSC
, OSC
, X1, X2,
and elements should be as short as possible, and must not
cross other wiring (see figure 25).
3. If the 32.768-kHz crystal oscillator is not used, the X1
pin must be fixed to V
CC
and X2
must be
open.
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