參數(shù)資料
型號: MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 23/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 109
Section 10: A/D CONVERTER
MOTOROLA
MC68HC05G3 (705G4) Specification Rev. 1.1
10.4.3
ADON - A/D ON
When the A/D is turned on (ADON = 1), it requires a time, t
ADON= 100s, for the current
sources to stabilize, and results can be inaccurate during this time. This bit turns on the
charge pump. Clearing ADON while the ADRC is set will disable the RC oscillator to save
power. When ADON is cleared, the A/D converter is completely turned off with no current
leakage.
10.4.4
CH3:CH0 - CHANNEL SELECT BITS
CH3, CH2, CH1, and CH0 form a 4-bit field which is used to select one of eight A/D
channels. Channels 0 through 7 correspond to port F input pins on the MCU. Channels C
through F are used for internal reference points. In user mode, channel F is reserved and
converts to $00. The following table shows the signals selected by the channel select field.
Using a port F pin as both an analog and digital input simultaneously is prohibited to prevent
excess power dissipation. When the A/D is enabled (ADON = 1) and one of the channels
0 through 7 is selected, the corresponding port F pin will appear as a logic zero to a digital
read. The remaining port F pins will read normally. To digitally read all eight port F pins
simultaneously, the A/D must be disabled (ADON = 0) or one of channels 8 through B must
be selected.
Table 10-1: A/D Channel Assignments
3
AD3 PORT F BIT 3
CHANNEL
SIGNAL
0
AD0 PORT F BIT 0
1
AD1 PORT F BIT 1
2
AD2 PORT F BIT 2
8 ~ B
RESERVED
CV
REFH
D(V
REFH
+ V
REFL
)/2
EV
REFL
7
AD7 PORT F BIT 7
4
AD4 PORT F BIT 4
5
AD5 PORT F BIT 5
6
AD6 PORT F BIT 6
F
FACTORY TEST
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