參數(shù)資料
型號: MC68HC05P18AMP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 125/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18AMP
NON-DISCLOSURE
AGREEMENT
REQUIRED
Analog-to-Digital (A/D) Converter
Technical Data
MC68HC05P18A
Analog-to-Digital (A/D) Converter
11.5.3 Multi-Channel Operation
An input multiplexer allows the A/D converter to select from one of four
external analog signals. Port C pins PC3–PC6 are shared with the inputs
to the multiplexer.
11.6 A/D Status and Control Register
The A/D status and control register (ADSCR) reports the completion of
A/D conversion and provides control over:
Oscillator selection
Analog subsystem power
Input channel selection
CC — Conversion Complete Bit
This read-only status bit is set when a conversion sequence has
completed and data is ready to be read from the ADC register. CC is
cleared when a channel is selected for conversion, when data is read
from the ADC register, or when the A/D subsystem is turned off. Once
a conversion is started, conversions of the selected channel continue
every 32 PH2 clock cycles until the ADSC register is written to again.
During continuous conversion operation, the ADC register is updated
with new data, and the CC bit is set, every 32 PH2 clock cycles. Also,
data from the previous conversion is overwritten regardless of the
state of the CC bit.
Address:
$001E
Bit 7
654321
Bit 0
Read:
CC
R
ADON
00
CH2
CH1
CH0
Write:
Reset:
00000000
= Unimplemented
R
= Reserved
Figure 11-1. A/D Status and Control Register (ADSCR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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