參數(shù)資料
型號(hào)： uPSD3234
廠商： 意法半導(dǎo)體
英文描述： Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可編程系統(tǒng)器)
中文描述： 閃存可編程系統(tǒng)器件與8032微控制器內(nèi)核（嵌入高速“8032微控制器核”的閃存型可編程系統(tǒng)器）
文件頁(yè)數(shù)： 7/54頁(yè)
文件大?。?/td> 736K
代理商： UPSD3234
7/54
AN1886 - APPLICATION NOTE
Possible Frequencies for μPSD with Low-speed USB
Any suitable external clock or crystal design can be used, as described in
AN1843
. It is strongly recom-
mended to use the 36MHz oscillator frequency for the USB, due to performance requirements when sup-
porting fast USB chip sets. (24MHz can also be used, but with more limitations.)
The following formula can be used to determine other possible oscillator frequencies. In all cases, the base
frequency for the USB block must be 6MHz, and oscillator frequency must not exceed 40MHz. It can be
obtained using the on-chip programmable prescaler. The USCL 8-bit Prescaler Register for the USB is
located in the SFR area at address E1h (
Table 4.
). The USCL should be loaded with a value that results
in a clock rate of 6MHz for the USB, using the following formula (where
f
OSC
is the MCU clock input fre-
quency):
Note: The USB works
only
with the MCU clock frequencies of 12, 24, or 36MHz. The prescaler values for
these frequencies are 0, 1, and 2. Do not forget to change the OSC constant in the
uPSD_HARDWARE.h
file of USB DEMO (36MHz is the default value).
Table 4. μPSD32xx USB SFR Register Map
SFR
Add
Reg
Name
Bit Register Name
ValueComments
7
6
5
4
3
2
1
0
E1
USCL
00
8-bit
rescaler for
USB logic
E6
UDT1
UDT1.7
UDT1.6
UDT1.5
UDT1.4
UDT1.3
UDT1.2
UDT1.1
UDT1.0
00
USB Endpt1
Data Xmit
E7
UDT0
UDT0.7
UDT0.6
UDT0.5
UDT0.4
UDT0.3
UDT0.2
UDT0.1
UDT0.0
00
USB Endpt0
Data Xmit
E8
UISTA
SUSPND
—
RSTF
TXD0F
RXD0F
RXD1F
EOPF
RESUMF
00
USB
Interrupt
Status
E9
UIEN
SUSPNDIE
RSTE
RSTFIE TXD0IE
RXD0IE
TXD1IE
EOPIE RESUMIE
00
USB
Interrupt
Enable
EA UCON0
TSEQ0
STALL0
TX0E
RX0E
TP0SIZ3 TP0SIZ2 TP0SIZ1 TP0SIZ0
00
USB Endpt0
Xmit Control
EB UCON1
TSEQ1
EP12SEL
—
FRESUM TP1SIZ3 TP1SIZ2 TP1SIZ1 TP1SIZ0
00
USB Endpt1
Xmit control
EC UCON2
—
—
—
SOUT
EP2E
EP1E
STALL2
STALL1
00
USB Control
Register
ED
USTA
RSEQ
SETUP
IN
OUT
RP0SIZ3 RP0SIZ2 RP0SIZ1 RP0SIZ0
00
USB Endpt0
Status
EE
UADR
USBEN
UADD6
UADD5
UADD4
UADD3
UADD2
UADD1
UADD0
00
USB
Address
Register
EF
UDR0
UDR0.7
UDR0.6 UDR0.5 UDR0.4
UDR0.3
UDR0.2
UDR0.1
UDR0.0
00
USB Endpt0
Data Recv
USB
clock_in
f
2
prescaler
1
+
------------------------------
=
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