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MC68HC908AT32 Datasheet, PDF (362/378 Pages) Freescale Semiconductor, Inc – Microcontrollers
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Electrical Specifications
29.5 Control Timing
Characteristic(1)
Bus operating frequency (4.5–5.5 V — VDD only)
RESET pulse width low
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period
EEPROM programming time per byte
EEPROM erasing time per byte
EEPROM erasing time per block
EEPROM erasing time per bulk
EEPROM programming voltage discharge period
16-bit timer(2)
Input capture pulse width(3)
Input capture period
Symbol
Min
fBUS
—
tRL
1.5
tILHI
1.5
tILIL
(3)
tEEPGM
10
tEBYTE
10
tEBLOCK
10
tEBULK
10
tEEFPV
100
tTH, tTL
2
tTLTL
(4)
Max
8.4 M
—
—
—
—
—
—
—
—
—
—
Unit
Hz
tcyc
tcyc
tcyc
ms
ms
ms
ms
µs
tcyc
1. VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted.
2. The 2-bit timer prescaler is the limiting factor in determining timer resolution.
3. Refer to Table 18-2. Mode, Edge, and Level Selection and supporting note.
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 TBD tcyc.
29.6 ADC Characteristics
Characteristic(1)
Min
Max
Unit
Comments
Resolution
8
8
Bits
Absolute accuracy
(VREFL = 0 V, VDDA = VREFH = 5 V ± 10%)
Conversion range
Power-up time
–1
VREFL
16
+1
VREFH
17
LSB
Includes quantization
V
VREFL = VSSA
µs
Conversion time period
Input leakage(2)
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(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
VREFL
VREFH
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.
MC68HC908AT32 Data Sheet, Rev. 3.1
362
Freescale Semiconductor
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