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MC68HC08AS32 Datasheet, PDF (266/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)
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17.5 Control Timing
Characteristic(1)
Symbol
Min
Max
Unit
Bus operating frequency (4.5–5.5 V — VDD only)
fBUS
—
8.4
MHz
RST pulse width low
tRL
1.5
—
tCYC
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period
tILHI
1.5
tILIL
(2)
—
tCYC
—
tCYC
EEPROM programming time per byte
tEEPGM
10
—
ms
EEPROM erasing time per byte
EEPROM erasing time per block
EEPROM erasing time per bulk
tEBYTE
10
—
ms
tEBLOCK
10
—
ms
tEBULK
10
—
ms
EEPROM programming voltage discharge period
tEEFPV
100
—
µs
16-bit timer(3)
Input capture pulse width(2)
Input capture period
tTH, tTL
2
tTLTL
(4)
—
tCYC
—
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted.
2. Refer to Table 15-2. Mode, Edge, and Level Selection and supporting note.
3. The 2-bit timer prescaler is the limiting factor in determining timer resolution.
4. The minimum period tTLTL or tILIL should not be less than the number of cycles it takes to execute the capture interrupt service
routine plus 1 tCYC.
17.6 ADC Characteristics
Characteristic
Min
Max
Unit
Comments
Resolution
8
8
Bits
Absolute accuracy
(VREFL = 0 V, VDDA = VREFH = 5 V ± 10%)
Conversion range(1)
Power-up time
–1
VREFL
16
+1
VREFH
17
LSB
Includes quantization
V
VREFL = VSSA
µs
Conversion time period
Input leakage(2) (3) ports B and D
—
±1
µA
Conversion Time
16
17
ADC clock cycles Includes sampling time
Monotonicity
Inherent within total error
Zero input reading
Full-scale reading
Sample time(2) (3)
00
01
Hex
VIN = VREFL
FE
FF
Hex
VIN = VREFH
5
—
ADC clock cycles
Input capacitance
—
8
pF
Not tested
ADC internal clock
500 k
1.048 M
Hz
Tested only at 1 MHz
Analog input voltage
–0.3
VDD + 0.3
V
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, VDDA/VDDAREF = 5.0 Vdc ± 10%, VSSA = 0 Vdc, VREFH = 5.0 Vdc ± 10%
2. The external system error caused by input leakage current is approximately equal to the product of R source and input current.
3. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
Data Sheet
266
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor
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