參數(shù)資料
型號: MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 128/145頁
文件大小: 673K
代理商: MC68HC05CL48
June 6, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
ANALOG TO DIGITAL CONVERTER
MOTOROLA
REV 2.0
10-3
10.4.3 ADON - A/D On
When the A/D is turned on (ADON = 1), it requires a time t
ADON for the current sources to
stabilize, and results can be inaccurate during this time. This bit turns on the charge pump.
If the ADRC is set, clearing this bit disables the RC oscillator to save power.
10.4.4 CH2:CH0 - Channel Select Bits
CH2, CH1, and CH0 form a 3-bit field which is used to select one of eight A/D channels.
Channels 0-3 correspond to the analog input pins: ATD(3:0) in the MCU. Channels 4-7
are used for internal reference points. The following table shows the signals selected by
the channel select field.
10.5
A/D DATA REGISTER (ADDR)
One 8-bit result register is provided. This register is updated each time COCO is set
10.6
A/D DURING WAIT MODE
The A/D continues normal operation during WAIT mode. To decrease power consumption
during WAIT, it is recommended that both the ADON and ADRC bits in the A/D Status and
Control Register be cleared if the A/D converter is not being used. If the A/D converter is
in use and the system clock rate is above 1.0 MHz, it is recommended that the ADRC bit
be cleared.
CHANNEL
SIGNAL
0
ATD0 pin
1
ATD1 pin
2
ATD2/PTC[4] pin
3
ATD3/PTC[5] pin
4VRH
5VRL
6(VRH - VRL)/4
7(VRH - VRL)/2
Table 10-1. A/D Channel Assignments
76543210
ADDR
$0025
READ
ADDR7
ADDR6
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
WRITE
RESET
UUUUUUUU
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