参数资料
型号: MC68HC705JJ7S
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封装: WINDOWED, CERAMIC, DIP-20
文件页数: 148/164页
文件大小: 1165K
代理商: MC68HC705JJ7S
Analog Subsystem
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
84
Freescale Semiconductor
P
Prescaler into timing function (
÷ P)
Using core timer
Using 16-bit programmable timer
Using software loops
8
24
8
User defined
8
User defined
÷ P
fOSC
Clock source frequency (excluding any
prescaling)
1. Limited by requirement for CEXT to be less than 2.0 F
Table 8-5. Sample Conversion Timing (VDD = 5.0 Vdc)
Bits
Counts
VX
(Vdc)
A/D Method
Clock Source
fOSC
(MHz)
tCHG
(ms)
CEXT (F)
416
3.5
Software loop
(12 bus cycles)
(24 fOSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
3.840
0.110
External pin oscillator
1.0
0.384
0.011
2.0
0.192
0.006
4.0
0.096
0.003
416
3.5
Programmable timer
(prescaler = 8)
Mode 2 or 3
(TOF
≥ ICF or OCF ≥ ICF)
Low-power oscillator
0.1
1.280
0.037
External pin oscillator
1.0
0.128
0.004
2.0
0.064
0.002
4.0
0.032
0.001
664
3.5
Software loop
(12 bus cycles)
(24 fOSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
15.36
0.439
External pin oscillator
1.0
1.536
0.044
2.0
0.768
0.022
4.0
0.384
0.011
664
3.5
Programmable timer
(prescaler = 8)
Mode 2 or 3
(TOF
≥ CF or OCF ≥ ICF)
Low-power oscillator
0.1
5.120
0.585
External pin oscillator
1.0
0.512
0.059
2.0
0.256
0.029
4.0
0.128
0.015
8
256
3.5
Software loop
(12 bus cycles)
(24 fOSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
61.44
1.755
External pin oscillator
1.0
6.144
0.176
2.0
3.072
0.088
4.0
1.536
0.044
8
256
3.5
Programmable timer
(prescaler = 8)
Mode 2 or 3
(TOF
≥ CF or OCF ≥ ICF)
Low-power oscillator
0.1
20.48
0.585
External pin oscillator
1.0
2.048
0.059
2.0
1.024
0.029
4.0
0.512
0.015
10
1024
3.5
Programmable timer
(prescaler = 8)
Mode 2 or 3
(TOF
≥ ICF or OCF ≥ ICF)
Low-power oscillator
0.1
Note 1
External pin oscillator
1.0
8.192
0.234
2.0
4.096
0.117
4.0
2.048
0.059
12
4096
3.5
Programmable timer
(prescaler = 8)
Mode 2 or 3
(TOF
≥ ICF or OCF ≥ ICF)
Low-power oscillator
0.1
Note 1
External pin oscillator
1.0
32.768
0.936
2.0
16.384
0.468
4.0
8.192
0.234
1. Not usable as the value of CEXT would be greater than 2.0 F
Table 8-4. A/D Conversion Parameters (Continued)
Name
Function
Min
Typ
Max
Units
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