AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 186

• Manufacturer Part Number: AN2131SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131SC

• 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: 16
• 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: 428-1306; AN2131SC

Note from item 12 that the ReNum bit is unchanged after a USB bus reset. Therefore, if a
device has ReNumerated
through a USB bus reset.
Although not strictly a “reset,” when the EZ-USB simulates a disconnect-reconnect in
order to ReNumerate , there are effects on the EZ-USB core:
EZ-USB TRM v1.9
10.6
•
•
•
Bulk IN endpoints are unarmed, and bulk OUT endpoints are armed (9-10).
Endpoint STALL bits are cleared (9-10).
Data toggles are reset (11).
EZ-USB Disconnect
Table 10-3. Effects of an EZ-USB Disconnect and Re-connect
Item
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
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
and loaded a new personality, it retains the new personality
Register
Chapter 10. EZ-USB Resets
uuuuuuuu u = unchanged
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
00000000 unarm, clear stall bit
00000000 Arm, clear stall bit
00000000 reset
uuuuuuuu ReNum bit unchanged
00000000 USB Function Address
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
uuuuuuuu
Default
Value
0
0
Comment
Page 10-7