參數(shù)資料
型號(hào)： UPD17149CTA1
廠商： NEC Corp.
英文描述： SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 小，通用4位單晶片微控制器
文件頁數(shù)： 45/102頁
文件大?。?/td> 408K
代理商： UPD17149CTA1
45
μ
PD17145(A1), 17147(A1), 17149(A1)
14. A/D CONVERTER
The
μ
PD17149(A1) is provided with an A/D converter with 4 analog input channels (P0C
0
/ADC
0
-P0C
3
/ADC
3
)
and a resolution of 8 bits.
This A/D converter is of the successive approximation type and operates in the following two modes:
1
Successive mode in which 8-bit A/D conversion is sequentially performed starting from the most
significant bit
Single mode in which an input analog voltage is compared with the set value of an 8-bit data register
2
14.1 Configuration of A/D Converter
Figure 14-1 shows the configuration of the A/D converter.
Figure 14-1. Block Diagram of A/D Converter
Note
The 8-bit data register (ADCR) is cleared to 00H when the STOP instruction is executed.
Internal bus
Read signal
P0Cn/ADCn
RF: 22H
0 0 ADCCH1 ADCCH0
RF: 20H
0 0 0
ADCSTRT
RF: 21H
ADCSOFT
0
ADCCMP
ADCEND
Control circuit
Comparator
Selector
Tap decoder
8-bit data register
Note
(ADCR)
8
8
D/A converter
R/2
R
R
3R/2
Remark
n = 0 to 3
Output
latch
4
Selector
P0CnIDI
P0CBIOn
P0F
1
input data
A/D end signal
STOP instruction signal
P0F
1
/V
REF
P0CnIDI
4
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