AT89C5131A-PUTUM Atmel, AT89C5131A-PUTUM Datasheet - Page 127

• Manufacturer Part Number: AT89C5131A-PUTUM
• Description: IC 8051 MCU FLASH 32K USB 32QFN
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5131A-PUTUM

• Core Processor: C52X2
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: LED, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 48 MHz
• Data Ram Size: 1.25 KB
• Number Of Programmable I/os: 34
• Number Of Timers: 16 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Mounting Style: SMD/SMT
• Height: 0.95 mm
• Interface Type: 2-Wire, EUART, SPI, USB
• Length: 7 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7 mm
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

21.4.2
4337K–USB–04/08
Bulk/Interrupt OUT Transactions in Ping-pong Mode
Figure 21-8. Bulk/Interrupt OUT Transactions in Ping-pong Mode
An endpoint will be first enabled and configured before being able to receive Bulk or Interrupt
packets.
When a valid OUT packet is received on the endpoint bank 0, the RXOUTB0 bit is set by the
USB controller. This triggers an interrupt if enabled. The firmware has to select the correspond-
ing endpoint, store the number of data bytes by reading the UBYCTLX and UBYCTHX registers.
If the received packet is a ZLP (Zero Length Packet), the UBYCTLX and UBYCTHX register val-
ues are equal to 0 and no data has to be read.
When all the endpoint FIFO bytes have been read, the firmware will clear the RXOUB0 bit to
allow the USB controller to accept the next OUT packet on the endpoint bank 0. This action
switches the endpoint bank 0 and 1. Until the RXOUTB0 bit has been cleared by the firmware,
the USB controller will answer a NAK handshake for each OUT requests on the bank 0 endpoint
FIFO.
When a new valid OUT packet is received on the endpoint bank 1, the RXOUTB1 bit is set by
the USB controller. This triggers an interrupt if enabled. The firmware empties the bank 1 end-
point FIFO before clearing the RXOUTB1 bit. Until the RXOUTB1 bit has been cleared by the
firmware, the USB controller will answer a NAK handshake for each OUT requests on the bank 1
endpoint FIFO.
The RXOUTB0 and RXOUTB1 bits are alternatively set by the USB controller at each new valid
packet receipt.
The firmware has to clear one of these two bits after having read all the data FIFO to allow a new
valid packet to be stored in the corresponding bank.
OUT
OUT
OUT
HOST
DATA0 (n Bytes)
DATA1 (m Bytes)
DATA0 (p Bytes)
ACK
ACK
ACK
UFI
RXOUTB0
RXOUTB1
RXOUTB0
Endpoint FIFO Bank 0 - Read Byte 1
Endpoint FIFO Bank 0 - Read Byte 2
Endpoint FIFO Bank 0 - Read Byte n
Endpoint FIFO Bank 1 - Read Byte 1
Endpoint FIFO Bank 1 - Read Byte 2
Endpoint FIFO Bank 1 - Read Byte m
Endpoint FIFO Bank 0 - Read Byte 1
Endpoint FIFO Bank 0 - Read Byte 2
Endpoint FIFO Bank 0 - Read Byte p
AT89C5130A/31A-M
Clear RXOUTB0
Clear RXOUTB1
Clear RXOUTB0
C51
127