參數(shù)資料
型號(hào): TMS370C742ANT
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁(yè)數(shù): 38/48頁(yè)
文件大小: 711K
代理商: TMS370C742ANT
TMS370Cx36
8-BIT MICROCONTROLLER
SPNS039B – JANUARY 1996 – REVISED FEBRUARY 1997
38
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
External
Clock Signal
XTAL1
XTAL2/CLKIN
C2
(see Note A)
C1
(see Note A)
Crystal/Ceramic
Resonator
(see Note B)
XTAL1
XTAL2/CLKIN
C3
(see Note A)
NOTES: A. The values of C1 and C2 are typically 15 pF and C3 value is typically 50 pF. See the manufacturer’s recommendations for ceramic
resonators.
B. The crystal/ceramic resonator frequency is four times the reciprocal of the system clock period.
Figure 11.
Recommended Crystal/Clock Connections
1.2 k
20 pF
VO
Load Voltage
Case 1: VO = VOH = 2.4 V; Load Voltage = 0 V
Case 2: VO = VOL = 0.4 V; Load Voltage = 2.1 V
NOTE A: All measurements are made with the pin loading as shown unless otherwise noted. All measurements are made with XTAL2/CLKIN
driven by an external square wave signal with a 50% duty cycle and rise and fall times less than 10 ns unless otherwise stated.
Figure 12. Typical Output Load Circuit (See Note A)
VCC
GND
300
20
I/O
Pin Data
Output
Enable
VCC
GND
INT1
6 k
20
30
Figure 13. Typical Buffer Circuitry
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