UPSD3454E-40U6 STMicroelectronics, UPSD3454E-40U6 Datasheet - Page 157
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UPSD3454E-40U6
Manufacturer Part Number
UPSD3454E-40U6
Description
MCU 8BIT 8032 256K FLASH 80-TQFP
Manufacturer
STMicroelectronics
Series
µPSDr
Datasheet
1.UPSD3422EV-40U6.pdf
(300 pages)
Specifications of UPSD3454E-40U6
Core Processor
8032
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, IrDA, SPI, UART/USART, USB
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
46
Program Memory Size
288KB (288K x 8)
Program Memory Type
FLASH
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TQFP, 80-VQFP
For Use With
497-5518 - EVAL BOARD RFID READER
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UPSD3454E-40U6
Manufacturer:
STMicroelectronics
Quantity:
10 000
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UPSD3422, UPSD3433, UPSD3434, UPSD3454
25.3.3
Note:
Table 98.
FIFO pairing
The FIFOs on endpoints 1 through 4 may be used independently as shown in
FIFOs with no Pairing or they may be selectively paired to provide double buffering (see
Figure 54 on page
rates with bulk transfers. Double buffering allows the CPU to process a data packet for an
Endpoint while the SIE is receiving or transmitting another packet of data on the same
Endpoint and direction. FIFO pairing is controlled by the USB pairing control register (see
UPAIR,
●
●
●
●
When the FIFOs are paired, the CPU must access the odd numbered FIFO while the even
numbered FIFOs are no longer available for use. Also when they are paired, the active FIFO
is automatically toggled by the update of USIZE.
●
Endpoint
IN FIFO 1 and 2
OUT FIFO 1 and 2
IN FIFO 3 and 4
OUT FIFO 3 and 4
Non-pairing FIFOs Example
Consider a case where the device needs to send 1024 bytes of data to the host.
Without FIFO pairing (see
bytes of data and waits until the host sends an IN token to Endpoint0, and the SIE
transfers the data to the host. Once all 64 bytes have been transferred by the SIE, the
FIFO becomes empty and the CPU starts writing the next 64 bytes of data to the FIFO.
While the CPU is writing the data to the FIFO, the host is sending IN tokens to
Endpoint0, requesting the next 64 bytes of data, but only gets NAKs while the FIFO is
being loaded. Once the FIFO has been loaded by the CPU, the SIE starts sending the
data to the host with the next IN Endpoint0 token. Again, the CPU waits until the SIE
transfers the 64 bytes of data to the host. This is repeated until all 1024 bytes have
been transferred.
0
0
1
1
2
2
3
3
4
4
Table 102 on page
Control
Control
Bulk/Interrupt OUT
Bulk/Interrupt IN
Bulk/Interrupt OUT
Bulk/Interrupt IN
Bulk/Interrupt OUT
Bulk/Interrupt IN
Bulk/Interrupt OUT
Bulk/Interrupt In
UPSD34xx supported endpoints
159). Double buffering provides an efficient way to optimize data transfer
Function
162). FIFO pairing options are listed below:
Figure
53), the CPU loads the IN Endpoint0 FIFO with 64
Max packet size (FIFO
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
64 bytes
size)
Supported directions
OUT
OUT
OUT
OUT
OUT
USB interface
IN
IN
IN
IN
IN
Figure 53
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