參數(shù)資料
型號: DMC73C168
英文描述: 8Bit Single Chip Microcontroller
中文描述: 8位單芯片微控制器
文件頁數(shù): 45/90頁
文件大?。?/td> 742K
代理商: DMC73C168
45
8Bit Single Chip Microcontroller
DMC73C167
5.5.3 Warming-up Timer
A 14-bit counter (P33, P34) is used as a warming-up delay timer which supplies a stable
oscillation condition from the system halt mode. The system clock cannot be active before
the warming-up counter's underflow. Fosc/2 (system clock frequency) is the decrementer
clock source of the 14-bit warm-up counter. The delay time is programmable by changing
P33 (the 6-bit MS value) and P34 (the 8-bit LS value).
Caution :
Set P35 to 0 before executing the IDLE instruction to avoid the unreliable setting of the
warming-up timer value.
5.6 A/D Converter
The key features of the A/D converter are as follows.
Analog input
Analog input range
Conversion
Resolution
Conversion time
: 1 channel (A0)
: VCC to VSS
: Successive approximation conversion
: 4 bit
:40 machine cycle
Figure 5-8. A/D Converter Function Diagram
5.6.1 Reference Values of A/D Conversion
The reference values of ADDATA are listed below. VSS and VCC are assumed to be 0 and
+5V, respectively.
££á££×££
Pin A0
Analog
Comparator
4- bit D/A
Converter
4- bit
Data Register
VSS
VCC
A/D START (P16.Bit7)
Enable Analog Input
(P16.Bit0)
0
1
General Input A0
ADDATA (P17)
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