mcf51ac256 Freescale Semiconductor, Inc, mcf51ac256 Datasheet - Page 26

• Manufacturer Part Number: mcf51ac256
• Description: Mcf51ac256 Coldfire Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

1
2
3
4
Preliminary Electrical Characteristics
2.9
26
1
2
3
4
5
Num C
Typical values assume V
only and are not tested in production.
1 LSB = (V
Monotonicity and No-Missing-Codes guaranteed in 10 bit and 8 bit modes
Based on input pad leakage current. Refer to pad electricals.
Data in Typical column was characterized at 3.0 V, 25°C or is typical recommended value.
When MCG is configured for FEE or FBE mode, input clock source must be divisible using RDIV to within the range of 31.25
kHz to 39.0625 kHz.
When MCG is configured for PEE or PBE mode, input clock source must be divisible using RDIV to within the range of 1 MHz
to 2MHz.
This parameter is characterized and not tested on each device. Proper PC board layout procedures must be followed to
achieve specifications.
4 MHz crystal
1
2
3
4
5
6
— Load capacitors
—
—
C
T
T
Table 15. Oscillator Electrical Specifications (Temperature Range = –40 to 105°C Ambient)
External Oscillator (XOSC) Characteristics
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
Feedback resistor
Series resistor
Crystal start-up time
Square wave input clock frequency (EREFS = 0, ERCLKEN =
1)
REFH
- V
REFL
)/2
High range (RANGE = 1, HGO = 1) BLPE mode
High range (RANGE = 1, HGO = 0) BLPE mode
DDAD
High range, high gain (RANGE = 1, HGO = 1)
High range (RANGE = 1) PEE or PBE mode
High range, high gain (RANGE = 1, HGO = 1)
High range, low gain (RANGE = 1, HGO = 0)
High range (RANGE = 1) FEE or FBE mode
N
Low range, high gain (RANGE = 0, HGO = 1)
Low range, high gain (RANGE = 0, HGO = 1)
High range, low gain (RANGE = 1, HGO = 0)
Low range, low gain (RANGE = 0, HGO = 0)
Low range, low gain (RANGE = 0, HGO = 0)
= 5.0 V, Temp = 25°C, f
MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.1
4
Preliminary—Subject to Change Without Notice
Rating
Low range (32 kHz to 38.4 kHz)
High range (1 MHz to 16 MHz)
Low range (RANGE = 0)
PEE or PBE mode
FEE or FBE mode
ADCK
= 1.0 MHz unless otherwise stated. Typical values are for reference
BLPE mode
≥ 8 MHz
4 MHz
1 MHz
2
3
5
5
2
3
t
t
CSTH-HGO
CSTL-HGO
Symbol
t
t
CSTH-LP
CSTL-LP
f
f
hi-hgo
f
f
f
hi-pll
extal
hi-fll
hi-lp
R
R
C
C
f
lo
F
S
1
2
0.03125
Min
manufacturer’s recommendation.
32
—
—
—
—
—
—
—
—
—
—
1
1
1
1
1
0
See crystal or resonator
Typical
100
200
400
10
15
Freescale Semiconductor
—
—
—
—
—
—
—
—
1
0
0
0
0
0
5
1
Max
38.4
16
16
10
20
16
40
—
—
—
—
—
—
—
5
8
0
5
MHz
MHz
MHz
MHz
MHz
Unit
kHz
MW
ms
kΩ