參數(shù)資料
型號: MC68HC11FC0CFU5
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Technical Summary 8-Bit Microcontroller
中文描述: 8-BIT, 6 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 49/74頁
文件大小: 513K
代理商: MC68HC11FC0CFU5
MC68HC11F1/FC0
MOTOROLA
MC68HC11FTS/D
53
11 Analog-to-Digital Converter
The MC68HC11F1 analog-to-digital (A/D) converter system uses an all-capacitive charge-redistribution
technique to convert analog signals to digital values. The A/D system is an 8-channel, 8-bit, multiplexed-
input, successive-approximation converter, accurate to
±1 least significant bit (LSB). Because the ca-
pacitive charge redistribution technique used includes a built-in sample-and-hold, no external sample-
and-hold is required.
Dedicated lines VRH and VRL provide the reference supply voltage inputs. Systems operating at clock
rates of 750 kHz or below must use an internal RC oscillator. The CSEL bit in the OPTION register se-
lects the clock source for the A/D system. (The CSEL bit is described in 11.3 A/D Registers, page 56.)
A multiplexer allows the single A/D converter to select one of 16 analog signals, as shown in Table 24.
NOTE
The A/D converter is present on the MC68HC11F1 only.
Figure 14 A/D Converter Block Diagram
EA9 A/D BLOCK
PE0
AN0
PE1
AN1
PE2
AN2
PE3
AN3
PE4
AN4
PE5
AN5
PE6
AN6
PE7
AN7
ANALOG
MUX
8-BIT CAPACITIVE DAC
WITH SAMPLE AND HOLD
SUCCESSIVE APPROXIMATION
REGISTER AND CONTROL
ADCTL A/D CONTROL
CB
CC
CD
MULT
SCAN
CCF
CA
ADR1 A/D RESULT 1
ADR2 A/D RESULT 2
ADR3 A/D RESULT 3
ADR4 A/D RESULT 4
RESULT REGISTER INTERFACE
RESULT
INTERNAL
DATA BUS
VRH
VRL
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