Datasheet

Electrical Specifications
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
368 Freescale Semiconductor
28.1.5 Control Timing
28.1.6 ADC Characteristics
Characteristic
(1)
1. V
DD
= 5.0 Vdc ± 0.5v, V
SS
= 0 Vdc, T
A
= –40 °C to T
A
(MAX), unless otherwise noted.
Symbol Min Max Unit
Bus Operating Frequency (4.5–5.5 V — V
DD
Only) f
BUS
—8.4MHz
R
ST Pulse Width Low
t
RL
1.5 —
t
cyc
IRQ Interrupt Pulse Width Low (Edge-Triggered)
t
ILHI
1.5 —
t
cyc
IRQ Interrupt Pulse Period
t
ILIL
Note 4 —
t
cyc
16-Bit Timer
(2)
Input Capture Pulse Width
(3)
Input Capture Period
2. The 2-bit timer prescaler is the limiting factor in determining timer resolution.
3. Refer to Table 25-2. Mode, Edge, and Level Selection and supporting note.
t
TH,
t
TL
t
TLTL
2
Note
(4)
4. The minimum period t
TLTL
or t
ILIL
should not be less than the number of cycles it takes to execute the capture interrupt service
routine plus TBD t
cyc
.
—
—
t
cyc
MSCAN Wake-up Filter Pulse Width
(5)
5. The minimum pulse width to wake up the MSCAN module is guaranteed by design but not tested.
t
WUP
25μs
Characteristic
(1)
1. V
DD
= 5.0 Vdc ± 0.5 V, V
SS
= 0 Vdc, V
DDA
/V
DDAREF
= 5.0 Vdc ± 0.5 V, V
SSA
= 0 Vdc, V
REFH
= 5.0 Vdc ± 0.5 V
Min Max Unit Comments
Resolution 8 8 Bits
Absolute Accuracy
(V
REFL
= 0 V, V
DDA
/V
DDAREF
= V
REFH
= 5 V ± 0.5 V)
–1 +1 LSB Includes Quantization
Conversion Range
(2)
2. Source impedances greater than 10 kΩ adversely affect internal RC charging time during input sampling.
V
REFL
V
REFH
V
V
REFL
= V
SSA
Power-Up Time 16 17 μs Conversion Time Period
Input Leakage
(3)
(Ports B and D)
3. The external system error caused by input leakage current is approximately equal to the product of R source and input current.
–1 1 μA
Conversion Time 16 17
ADC Clock
Cycles
Includes Sampling Time
Monotonicity Inherent within Total Error
Zero Input Reading 00 01 Hex
V
IN
= V
REFL
Full-Scale Reading FE FF Hex
V
IN
= V
REFH
Sample Time
(2)
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
V
REFL
V
REFH
V