MAS6512 datasheet(14/32 Pages) MAS

14 / 32 page

DA6512.003

2 December, 2016

14 (32)

OSCILLATOR FREQUENCY CONTROL REGISTER (E6/66HEX)

Note that the internal clock oscillator frequency has

been factory trimmed and the trim value has been

stored

the

EEPROM

(C6/46HEX).

recommended

not

change

the

factory

programmed value!

The oscillator frequency control register (E6/66HEX)

is for trimming the internal clock oscillator to 200

kHz frequency. This 200 kHz can be measured at

the OSC pin. The six LSB bits adjust the oscillator

period in 104ns steps. The period increases when

the trim value increases. Typically a register value

of 28HEX corresponds to the nominal 200 kHz clock

oscillator frequency. After finding a suitable trim

value it can be stored to the EEPROM (C6/46HEX).

Table 7. Oscillator frequency control register (E6/66HEX)

Bit Number

Bit Name

Description

Value

Function

5-0

OSCF

Oscillator frequency

control bits

0HEX…3FHEX

Oscillator frequency control

EEPROM DATA INPUT REGISTER (E8/68HEX)

This register can be ignored by user. It is related to

internal EEPROM operations and updated

automatically during every EEPROM write

operation.

EEPROM WRITE ENABLE REGISTER (E9/69HEX)

The EEPROM is normally write protected. To

enable write the EEPROM write enable register

should be set to %00000100 (04HEX). To disable

write the register should be set to %00000000

(00HEX) which is the register default value after

power-on-rest or manual reset by XCLR or reset

enable register values than these two since other

purpose only.

Table 8. EEPROM write enable register (E9/69HEX)

Bit Number

Bit Name

Description

Value

Function

7-3

00000

Reserved. Keep these bits

always 0.

EWE

EEPROM write enable

EEPROM write disabled

EEPROM write enabled

1-0

Reserved. Keep these bits

always 0.

After a power-on-reset and in normal operation the

EEPROM write enable register has the default value

00HEX.

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