Online digital trimming procedure

SEA01

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3.5

Read commands and status register

It is possible to read the content of the volatile memory and also the status of the NVM

memory (two OTP), that indicates how many times the NVM has been burned (zero, one or

two) or if a an error occurred during the trimming process (Status register) (see Table 8).

The read command of the volatile memory can be used to check the value written in the

volatile memory before permanently storing it, increasing the robustness of the trimming

process. As described in Section 3.4: Emulation commands, the read of the non-volatile

memory is necessary to reset the internal parity fail flag eventually activated by a

communication error during the trimming process.

3.5.1

register. It is a write/read command and corresponds to the code given in Table 5

to 'one'. The device will send to the data bus an 8-bit word where the first two bits are the

check as the last bit.

Table 8. Status register

Status register

NVM write residual

possibility

Parity fail flag

M1

M2

00

2

0

01

1

0

10

0

0

11

X

1

Byte 1

(address, write

type)

Byte 2

command

Byte 3

(address, read

type)

Byte 4

read data

S

x

x

Sent by slave (device)

x

x

Sent by master