MC9S12UF32 Datasheet, PDF (95/128 Pages) Freescale Semiconductor, Inc – System on a Chip Guide V01.05

System on a Chip Guide — 9S12UF32DGV1/D V01.05
C7 (22pF)
X1
(12MHz)
C8 (22pF)
EXTAL
R5
(1MΩ)
XTAL
CON1
(USB Input)
VDD ¹
D-
D+
2
3
GND ⁴
L1
R21 (10Ω)
R1 (33Ω)
R2 (33Ω)
R22 (10Ω)
5V
DMH
DMF
DPF
DPH
R10 (3.3KΩ)
5V
1
2
3
4
CON2
5V
BKGD
RESETB
5V
Q1
MMBF0201N
REF3V
BKGD
RESETB
5V
3V3
1
2
MODB
3 _BKGD
4 _TEST
5 _RESET
6 _VSSR
7 _VDDR
8 _REF3V
9
10
11
12
13
14
15
16
3V3
REF3V
C5 (100nF)
MC9S12UF32
64 LQFP
EXTAL
XTAL
48
47
46
45
44
VDDX
VSSX
43
42
41
3V3
40
39
38
37
36
35
34
33
Figure 22-1 Sample schematic with 64-pin LQFP MC9S12UF32
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
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