MC68HC705JP7 Datasheet, PDF (127/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Analog Subsystem
A/D Conversion Methods
Table 8-5. Sample Conversion Timing (V_DD = 5.0 Vdc)
Bits Counts ^VX
(Vdc)
A/D Method
Clock Source
f_OSC
(MHz)
Software loop
4
16
3.5
(12 bus cycles)
(24 f_OSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
1.0
External pin oscillator
2.0
4.0
Programmable timer
Low-power oscillator
0.1
4
16
3.5
(prescaler = 8)
Mode 2 or 3
1.0
External pin oscillator
2.0
(TOF ≥ ICF or OCF ≥ ICF)
4.0
Software loop
6
64
3.5
(12 bus cycles)
(24 f_OSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
1.0
External pin oscillator
2.0
4.0
Programmable timer
Low-power oscillator
0.1
6
64
3.5
(prescaler = 8)
Mode 2 or 3
1.0
External pin oscillator
2.0
(TOF ≥ CF or OCF ≥ ICF)
4.0
8
256
3.5
Software loop
(12 bus cycles)
(24 f_OSC cycles)
Mode 0 or 1 (manual)
Low-power oscillator
0.1
1.0
External pin oscillator
2.0
4.0
Programmable timer
Low-power oscillator
0.1
8
256
3.5
(prescaler = 8)
Mode 2 or 3
1.0
External pin oscillator
2.0
(TOF ≥ CF or OCF ≥ ICF)
4.0
Programmable timer
Low-power oscillator
0.1
10 1024 3.5
(prescaler = 8)
Mode 2 or 3
1.0
External pin oscillator
2.0
(TOF ≥ ICF or OCF ≥ ICF)
4.0
Programmable timer
Low-power oscillator
0.1
12 4096 3.5
(prescaler = 8)
Mode 2 or 3
1.0
External pin oscillator
2.0
(TOF ≥ ICF or OCF ≥ ICF)
4.0
1. Not usable as the value of C_EXT would be greater than 2.0 µF
t_CHG
(ms)
3.840
0.384
0.192
0.096
1.280
0.128
0.064
0.032
15.36
1.536
0.768
0.384
5.120
0.512
0.256
0.128
61.44
6.144
3.072
1.536
20.48
2.048
1.024
0.512
Note 1
8.192
4.096
2.048
Note 1
32.768
16.384
8.192
C_EXT
(µF)
0.110
0.011
0.006
0.003
0.037
0.004
0.002
0.001
0.439
0.044
0.022
0.011
0.585
0.059
0.029
0.015
1.755
0.176
0.088
0.044
0.585
0.059
0.029
0.015
Note 1
0.234
0.117
0.059
Note 1
0.936
0.468
0.234
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
Analog Subsystem
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