AN2135SC Cypress Semiconductor Corp, AN2135SC Datasheet - Page 176

• Manufacturer Part Number: AN2135SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2135SC

• 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: 8
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1308

Chapter 4, "EZ-USB Input/Output" describes the 8051 interface to the EZ-USB I
troller. The 8051 uses two registers, I2CS (I
to transfer data over the I
by setting the DONE bit (I2CS.0) high, which also sets an I
(Figure 9-8). This interrupt request is routed to the 8051 INT3 interrupt.
The 8051 enables the I
the interrupt request flag by reading EXIF.5, and resets the INT3 interrupt request by writ-
ing a zero to EXIF.5. Any 8051 read or write to the I2DAT or I2CS register automatically
clears the I
The EZ-USB family responds to an IN token from the host by loading an IN endpoint
buffer and then arming the endpoint by loading a byte count for the endpoint. After the
host successfully receives the IN data, the 8051 receives an EP-IN interrupt, signifying
that the IN endpoint buffer is once again ready to accept data.
EZ-USB TRM v1.9
9.12
9.13
I
In Bulk NAK Interrupt - (AN2122/AN2126 only)
I2DAT register
2
C Interrupt
I2DAT
RD or WR
2
I2CS
C interrupt request.
DONE
START
D7
2
Figure 9-8. I
C interrupt by setting EIE.1=1. The 8051 determines the state of
I
2
2
C Interrupt
Request
C bus. The EZ-USB core signals completion of a byte transfer
STOP
R
S
D6
EZ-USB 8051
LASTRD
Chapter 9. EZ-USB Interrupts
2
D5
C Interrupt Enable Bits and Registers
ID1
D4
EXIF.5(0)
2
C Control and Status) and I2DAT (I
R
S
ID0
D3
EIE.1
BERR
D2
EXIF.5(rd)
2
C interrupt request latch
ACK
D1
DONE
8051 I
D0
Interrupt
(INT3)
2
C
2
2
C Data)
C con-
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