mc9s12uf32 Freescale Semiconductor, Inc, mc9s12uf32 Datasheet - Page 95

• Manufacturer Part Number: mc9s12uf32
• Description: System Chip Guide V01.05
• Manufacturer: Freescale Semiconductor, Inc

22.1.1 Power Supply Notes
A 5V power is required. Figure 22-1 shows an example of bus-powered USB device. Special
considerations are needed in the choice of capacitors and other power consumptions of the board in order
to fulfil the USB current requirement. Alternatively, the board can be designed for self-powered USB
device.
22.1.2 Clocking Notes
For proper operation of USB and storage interface of the MC9S12UF32, a 12-MHz crystal is required to
provide the clock input to the integrated USB PHY. The crystal must connect to the MC9S12UF32 in a
Pierce configuration by the XTAL and EXTAL pins as shown.
Freescale Semiconductor
5V
5V
CON1
(USB Input)
VDD
GND
D+
D-
C8 (22pF)
C7 (22pF)
R10 (3.3K )
CON2
1
2
3
4
REF3V
1
2
3
4
(12MHz)
X1
Figure 22-1 Sample schematic with 64-pin LQFP MC9S12UF32
R21 (10 )
R1 (33 )
R2 (33 )
R22 (10 )
L1
R5
(1M )
Q1
MMBF0201N
BKGD
RESETB
5V
EXTAL
XTAL
5V
DMH
DMF
DPF
DPH
REF3V
3V3
RESETB
BKGD
5V
System on a Chip Guide — 9S12UF32DGV1/D V01.05
3V3
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
BKGD
TEST
RESET
VSSR
VDDR
REF3V
MC9S12UF32
64 LQFP
C5 (100nF)
VDDX
VSSX
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
EXTAL
XTAL
3V3
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