C8051T630 Datasheet, PDF(89/221 Page) Silicon Laboratories – Mixed-Signal Byte-Programmable EPROM MCU

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C8051T630 Datasheet, PDF (89/221 Pages) Silicon Laboratories – Mixed-Signal Byte-Programmable EPROM MCU

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C8051T630/1/2/3/4/5

16. EPROM Memory

Electrically programmable read-only memory (EPROM) is included on-chip for program code storage. The

EPROM memory can be programmed via the C2 debug and programming interface when a special pro-

gramming voltage is applied to the VPP pin. Each location in EPROM memory is programmable only once

(i.e., non-erasable). Table 5.6 on page 26 shows the EPROM specifications.

16.1. Programming and Reading the EPROM Memory

Reading and writing the EPROM memory is accomplished through the C2 programming and debug inter-

face. When creating hardware to program the EPROM, it is necessary to follow the programming steps

listed below. Refer to the âC2 Interface Specificationâ available at http://www.silabs.com for details on com-

municating via the C2 interface. Section â26. C2 Interfaceâ on page 210 has information about C2 register

addresses for the C8051T630/1/2/3/4/5.

16.1.1. EPROM Write Procedure

1. Reset the device using the RST pin.

2. Wait at least 20 Âµs before sending the first C2 command.

3. Place the device in core reset: Write 0x04 to the DEVCTL register.

4. Set the device to program mode (1st step): Write 0x40 to the EPCTL register.

5. Set the device to program mode (2nd step): Write 0x58 to the EPCTL register.

6. Apply the VPP programming Voltage.

7. Write the first EPROM address for programming to EPADDRH and EPADDRL.

8. Write a data byte to EPDAT. EPADDRH:L will increment by 1 after this write.

9. Use a C2 Address Read command to poll for write completion.

10.(Optional) Check the ERROR bit in register EPSTAT and abort the programming operation if necessary.

11. If programming is not finished, return to Step 8 to write the next address in sequence, or return to

Step 7 to program a new address.

12.Remove the VPP programming Voltage

13.Remove program mode (1st step): Write 0x40 to the EPCTL register.

14.Remove program mode (2nd step): Write 0x00 to the EPCTL register.

15.Reset the device: Write 0x02 and then 0x00 to the DEVCTL register.

Important Note: There is a finite amount of time which VPP can be applied without damaging the device,

which is cumulative over the life of the device. Refer to Table 5.1 on page 23 for the VPP timing specifica-

tion.

Rev. 1.0

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