MAS6503 datasheet(17/34 Pages) MAS

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DA6503.005

14 December 2016

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OSCILLATOR FREQUENCY CONTROL REGISTER (E4/64HEX)

Note that the internal clock oscillator frequency has

been factory trimmed and the trim value has been

stored

the

EEPROM

(DF/5FHEX).

recommended

not

change

the

factory

programmed value!

The oscillator frequency control register (E4/64HEX)

is for trimming the internal clock oscillator to 500

kHz frequency. When settings FOSC=1 in the Test

measured at the OSC pin.

The six LSB bits adjust the oscillator signal period

in 65ns steps. The signal period decreases and

frequency increases when the trim value increases.

The six bit register value is considered as a 2’s

complement number. Typically a mid value 00HEX

corresponds to the nominal 500 kHz clock oscillator

frequency.

After finding a suitable trim value it can be stored to

the EEPROM (DF/5FHEX).

Table 5. Oscillator frequency control register (E6/66HEX)

Bit

Number

Bit Name

Description

Value

(bin)

Value

(2’s

complement)

Value

(dec)

Function

7-6

Not used

5-0

OSCF

Oscillator

frequency

control

011111

011110

…….

000001

000000

111111

111110

…….

100001

100000

…

-1

-2

…

-31

-32

…

Max frequency

…

Nominal 500 kHz

…

Min frequency

X = Don’t care

EEPROM DATA INPUT REGISTER (E5/65HEX)

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 (E6/66HEX)

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-reset or manual reset by XCLR or by

reset register. Note: don’t use any other EEPROM

write enable register values than these two since

other register bits are reserved for internal testing

purpose only.

Table 6. 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.

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