ZAMC4100 datasheet(101/156 Pages) RENESAS

101 / 156 page

ZAMC4100 Datasheet

101

January 26, 2016

Address

[HEX]

Reset

Value,

[HEX]

Description

PWM control registers

PWMDCFG

PWM duty cycle configuration

PWMFCFG

PWM frequency configuration

PWMDREN

PWM driver enable

Analog trim registers

OSCHTRM

OSCH frequency trimming

OSCLTRM

OSCL frequency trimming

CREFTRM

Reference current trimming

AUTHSIG

Authentication signature write

3.14.2. Registers Write Access Signatures

There are two signatures pertaining to WRITE access for registers:

•

APPLICATION signature: enables the WRITE access in the application registers.

•

TRIM signature: enables the WRITE access in analog trim registers.

Both signatures are mutually exclusive. This means that if the application registers are WRITE accessible, the

analog trim registers are READ-only and vice versa. The purpose of this logic is to avoid unintentional overwriting

of the trim registers by the MCU and losing the correct calibration values.

The SBC indicates which signature is set with the ACCSIG bit, which is allocated in the slave status byte (see

section 3.7.5):

•

Bit ACCSIG = 0: APPLICATION access signature is set.

•

Bit ACCSIG = 1: TRIM access signature is set.

AUTHSIG register

The AUTHSIG register is allocated at address 1FHEX in the SBC register file. It is not physically implemented.

Writing the correct values in this register will set the corresponding access signature. Reading the register will

return a zero value.

TRIM signature setting

In order to set the TRIM signature, the MCU must consecutively write the AUTHSIG register (address 1FHEX) with

the values ADHEX and B6HEX. For successful signature setting, both values should be written as two consecutive

SPI WRITE accesses. If between the two writes, the MCU executes READ or WRITE access for another address,

then no TRIM signature will be set.

APPLICATION signature setting

Once the TRIM signature is set, the MCU can return to having application registers access by writing the value

00HEX in the AUTHSIG register.

ZAMC4100 Datasheet(PDF) 101 Page - Renesas Technology Corp

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