AN2135SC Cypress Semiconductor Corp, AN2135SC Datasheet - Page 80

• 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

As shown in Table 5-2, after enumeration, the EZ-USB core responds to the following
host requests.
To ensure proper operation of the default Keil Monitor, which uses SIO-1 (RXD1 and
TXD1), never change the following Port Config bits from “1”:
To ensure the 8051 processor can access the external SRAM (including the Keil Monitor),
do not change the following bits from “1”:
To ensure that no bits are unintentionally changed, all writes to the PORTxCFG registers
should use a read-modify-write series of instructions.
The USB Specification provides for vendor-specific requests to be sent over CONTROL
endpoint zero. The EZ-USB chip uses this feature to transfer data between the host and
EZ-USB RAM. The EZ-USB core responds to two “Firmware Load” requests, as shown
in Tables 5-3 and 5-4.
EZ-USB TRM v1.9
5.4
•
•
•
•
•
•
•
Set or clear an endpoint stall (Set/Clear Feature-Endpoint).
Read the stall status for an endpoint (Get_Status_Endpoint).
Set/Read an 8-bit configuration number (Set/Get_Configuration).
Set/Read a 2-bit interface alternate setting (Set/Get_Interface).
Download or upload 8051 RAM.
PORTBCFG bits 2 (RXD1) and 3 (TXD1).
PORTCCFG bits 6 (WR#) and 7 (RD#).
Firmware Load
Byte
0
1
2
3
4
5
6
7
bmRequest
bRequest
wValueL
wValueH
wIndexL
wIndexH
wLenghtL
wLengthH
Field
Table 5-3. Firmware Download
AddrH
AddrL
Value
Chapter 5. EZ-USB CPU
LenH
0xA0
LenL
0x40
0x00
0x00
Vendor Request, OUT
“Firmware Load”
Starting Address
Number of Bytes
Meaning
8051 Response
None required
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