參數(shù)資料
型號(hào)： MC68L11F1CFN3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 38/174頁
文件大小： 981K
代理商： MC68L11F1CFN3
MOTOROLA
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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MC68L11F1CFNE3 功能描述:8位微控制器 -MCU 8B MCU 1KRAM 512BYTES RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC68L11K1FN2R2 制造商:Motorola Inc 功能描述:
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MC68L711E9FN2 制造商:Rochester Electronics LLC 功能描述:- Bulk
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