参数资料
型号: MC68HC11F1CPU4
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 4 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 14 MM, 1.40 MM HEIGHT, LQFP-80
文件页数: 38/162页
文件大小: 4554K
代理商: MC68HC11F1CPU4
ANALOG-TO-DIGITAL CONVERTER
MC68HC11F1
10-8
TECHNICAL DATA
NOTE
When the multiple-channel continuous scan mode is used, extra care
is needed in the design of circuitry driving the A/D inputs. The charge
on the capacitive DAC array before the sample time is related to the
voltage on the previously converted channel. A charge share situa-
tion exists between the internal DAC capacitance and the external
circuit capacitance. Although the amount of charge involved is small,
the rate at which it is repeated is every 64
s for an E clock of 2 MHz.
The RC charging rate of the external circuit must be balanced against
this charge sharing effect to avoid errors in accuracy. Refer to
M68HC11 Reference Manual (M68HC11RM/AD) for further informa-
tion.
CD–CA — Channel Selects D–A
Refer to Table 10-2. When a multiple channel mode is selected (MULT = 1), the two
least significant channel select bits (CB and CA) have no meaning and the CD and CC
bits specify which group of four channels is to be converted.
*Used for factory testing
10.9 A/D Converter Result Registers
These read-only registers hold an 8-bit conversion result. Writes to these registers
have no effect. Data in the A/D converter result registers is valid when the CCF flag in
the ADCTL register is set, indicating a conversion sequence is complete. If conversion
results are needed sooner, refer to Figure 10-3, which shows the A/D conversion se-
quence diagram.
Table 10-2 A/D Converter Channel Selection
Channel Select
Control Bits
Channel Signal
Result in ADRx if
MULT = 1
CD:CC:CB:CA
0000
AN0
ADR1
0001
AN1
ADR2
0010
AN2
ADR3
0011
AN3
ADR4
0100
AN4
ADR1
0101
AN5
ADR2
0110
AN6
ADR3
0111
AN7
ADR4
1000
Reserved
—
1001
Reserved
—
1010
Reserved
—
1011
Reserved
—
1100
VRH*
ADR1
1101
VRL*
ADR2
1110
(VRH)/2*
ADR3
1111
Reserved*
ADR4
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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