AN2135SC Cypress Semiconductor Corp, AN2135SC Datasheet - Page 185

• 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

A USB bus reset leaves most EZ-USB resources unchanged. From Table 10-2, after USB
bus reset:
Page 10-6
•
•
•
•
The EZ-USB core unarms all Bulk IN endpoints (9). Data loaded by the 8051 into
an IN endpoint buffer remains there, and the 8051 firmware can either re-send it by
loading the endpoint byte count register to re-arm the transfer, or send new data by
re-loading the IN buffer before re-arming the endpoint.
Bulk OUT endpoints retain their busy states (10). Data sent by the host to an OUT
endpoint buffer remains in the buffer, and the 8051 firmware can either read the
data or reject it as stale simply by not reading it. In either case, the 8051 loads a
dummy value to the endpoint byte count register to re-arm OUT transfers.
Toggle bits are cleared (11).
The device address is reset to zero (13).
Item
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
Table 10-2. EZ-USB States After a USB Bus Reset
Endpt Data
Byte Counts
CPUCS
PORT Configs
PORT Registers
PORT OEs
Interrupt Enables
Interrupt Reqs
Bulk IN C/S
Bulk OUT C/S
Toggle Bits
USBCS
FNADDR
IN07VAL
OUT07VAL
INISOVAL
OUTISOVAL
USBPAIR
Configuration
Alternate Setting
Register
Chapter 10. EZ-USB Resets
uuuuuuuu u = unchanged
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
00000000 unarm
uuuuuuuu retain armed/unarmed state
00000000
uuuuuuuu ReNum bit unchanged
00000000 USB Function Address
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
Default
Value
0
0
Comment
EZ-USB TRM v1.9