AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 321

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

If the above conditions are met, the serial port then writes the received byte to the SBUF0 (or
SBUF1) register, loads the stop bit into RB8_0 (or RB8_1), and sets the RI_0 (or RI_1) bit. If
the above conditions are not met, the received data is lost, the SBUF register and RB8 bit are
not loaded, and the RI bit is not set. After the middle of the stop bit time, the serial port waits
for another high-to-low transition on the RXD0 (or RXD1) pin.
EZ-USB TRM v1.9
Bit detector
RXD0OUT
sampling
RXD0OUT
RX CLK
SHIFT
RXD0
Write to
TXD0
SBUF0
TX CLK
RI_0
TI_0
SHIFT
TXD0
RXD0
TI_0
RI_0
Figure C-13. Serial Port 0 Mode 2 Transmit Timing
Figure C-14. Serial Port 0 Mode 2 Receive Timing
START
START
Appendix C: 8051 Hardware Description
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
D6
D6
D7
D7
RB8
TB8
STOP
STOP
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