参数资料
型号: MC68HC05V7FN
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 151/170页
文件大小: 589K
代理商: MC68HC05V7FN
SECTION 10: A/D CONVERTER
MOTOROLA
Page 67
MC68HC05V7 Specification Rev. 1.0
10.4.2
ADRC - RC Oscillator Control
When ADRC is set, the A/D section runs on the internal RC oscillator instead of the CPU
clock. The RC oscillator requires a time t
RCON to stabilize, and results can be inaccurate
during this time.
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.
10.4.4
CH4:CH0 - Channel Select Bits
CH4, CH3, CH2, CH1, and CH0 form a 5-bit field which is used to select one of twenty A/
D channels, including four internal references. Channels $0-7 correspond to Port D input
pins on the MCU. Channels $8-F correspond to Port E input pins on the MCU and are not
bonded out in 56 pin packaged parts. Channels $10-13 are used for internal reference
points. In Single-Chip Mode, channel $13 is reserved and converts to $00. The following
table shows the signals selected by the channel select field.
Table 10-1: A/D Channel Assignments
10.5
A/D DATA REGISTERS
An 8-bit result register is provided. This register is updated each time the COCO bit is set.
Figure 10-2:
A/D Data Register
CH4:CH0
Signal
00-07
AN0-7
08-0F
AN8-15
10
V
REFH
11
(V
REFH-
V
REFL)/2
12
V
REFL
13
Factory
Test
14
Unused
D7
D5
D4
D3
D2
D1
D0
D6
$1D
*
* Accuracy not guaranteed for internal channels
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