ZAMC4100 datasheet(102/156 Pages) RENESAS

102 / 156 page

ZAMC4100 Datasheet

102

January 26, 2016

3.15. SBC Trimming

All SBC analog circuitry trimming values are stored in the INFO page 0 of the MCU FLASH memory (Figure 4.1)

during the ZAMC4100 production test. The MCU firmware has READ-only access to this partition; i.e., no trim

data corruption is possible due to firmware malfunction.

This procedure must be implemented as part of the MCU firmware and executed during system initialization.

When executed, the trimming procedure reads the OSCH, OSCL and Reference Current trim values from the

FLASH INFO page and transfers them to the corresponding SBC trim registers.

ZAMC4100 trimming procedure

Trimming data is located in the INFO page 0 at offset 00000040HEX. Trimming data is programmed in one word

and has the following structure:

Figure 3.29 Structure of SBC Trimming Data

Byte 3

Byte 2

Byte 1

Byte 0

Not Used

CREF

OSCH

OSCL

The trimming procedure is given below. It must be executed as soon as the device is powered:

1. Disable the watchdog timer.

2. Write ADHEX to the AUTHSIG register of the SBC.

3. Write B6HEX to the AUTHSIG register of the SBC.

4. Write OSCH to the OSCHTRM register of the SBC.

5. Write OSCL to the OSCLTRM register of the SBC.

6. Write CREF to the CREFTRM register of the SBC.

7. Write 00HEX to AUTHSIG.

8. Setup and enable the watchdog timer. This step is optional.

This procedure prepares the MCU clock and current sources to be at their optimal value. It must be executed

immediately after each MCU reset.

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