AN2131-DK001 Cypress Semiconductor Corp, AN2131-DK001 Datasheet - Page 201

• Manufacturer Part Number: AN2131-DK001
• Description: KIT EZ-USB DEVELOPMENT BOARD
• Manufacturer: Cypress Semiconductor Corp

Specifications of AN2131-DK001

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1333

This register enables the CLK24 output and permits the host to reset the 8051 using a
Firmware Download.
Bit 7-4:
These register bits define the silicon revision. Consult individual Cypress Semiconductor
data sheets for values.
Bit 1:
When this bit is set to 1, the internal 24-MHz clock is connected to the EZ-USB CLK24
pin. When this bit is 0, the CLK24 pin drives HI. This bit can be written by the 8051 only.
Bit 0:
The USB host writes “1” to this bit to reset the 8051, and “0” to run the 8051. Only the
USB host can write this bit.
Page 12-8
CPUCS
12.5
RV3
RV3
b7
R
CPU Registers
RV[3..0]
CLK24OE
8051RES
RV2
RV2
b6
R
Figure 12-5. CPU Control and Status Register
RV1
RV1
b5
R
Silicon Revision
Output enable - CLK24 pin
8051 reset
CPU Control and Status
Chapter 12. EZ-USB Registers
RV0
RV0
b4
R
b3
R
0
0
b2
R
0
0
CLK24OE
R/W
b1
1
EZ-USB TRM v1.9
8051RES
b0
R
1
7F92