DS80C320-ENG datasheet(30/175 Pages) DALLAS

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High-Speed Microcontroller User’s Guide

30 of 175

RTC Trim Register (TRIM)

SFR 91h

E4K

X12/

TRM2

TRM1

TRM0

RT-*

R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset, *=See description

E4K

Bit 7

External 4096 Hz RTC Signal Enable. This bit enables the output of a

4096 Hz signal on pin P1.7 derived from the RTC. Setting this bit overrides

any other function of the pin. It is used for adjusting the frequency of the

32.768 RTC crystal oscillator using the trim bits. This bit is cleared to 0

after any reset, including a no-battery reset.

0 = Calibration function disabled. P1.7 pin will function per the normal pin

description.

1 = 4096 Hz signal output on P1.7

X12/ 6

Bit 6

RTC Crystal Capacitance Select.

This bit selects the internal loading

capacitance of the RTC crystal amplifier. This bit is set to 1 after a no-battery

reset, and unchanged by all other forms of reset.

0 = RTC loading is set for 6 pF crystal.

1 = RTC loading is set for 12.5 pF crystal.

TRM2

Bit 5

RTC Trim Bit 2. This bit controls the relative adjustment of the RTC internal

capacitance. It is used to calibrate the RTC oscillator frequency. This bit is set to

1 after a no-battery reset, and unchanged by all other forms of reset.

TRM2

Bit 4

RTC Trim Bit 2. This bit controls the relative adjustment of the RTC internal

capacitance. It is used to calibrate the RTC oscillator frequency. This bit is set to

1 after a no-battery reset, and unchanged by all other forms of reset.

TRM1

Bit 3

RTC Trim Bit 1. This bit controls the relative adjustment of the RTC internal

capacitance. It is used to calibrate the RTC oscillator frequency. This bit is set to

0 after a no-battery reset, and unchanged by all other forms of reset.

TRM1

Bit 2

RTC Inverted Trim Bit 1. This bit must always be set to the complement of

the TRM1 bit. Incorrectly writing this bit will default bits TRIM.7, TRIM.5-0 to

their no-battery reset value. This bit is cleared to 1 after a no-battery reset, and

unchanged by all other forms of reset.

TRM0

Bit 1

RTC Trim Bit 0. This bit controls the relative adjustment of the RTC internal

capacitance. It is used to calibrate the RTC oscillator frequency. This bit is set to

0 after a no-battery reset, and unchanged by all other forms of reset.

TRM0

Bit 0

RTC Inverted Trim Bit 0. This bit must always be set to the complement of

the TRM0 bit. Incorrectly writing this bit will default bits TRIM.7, TRIM.5-0 to

their no-battery reset value. This bit is cleared to 1 after a no-battery reset, and

unchanged by all other forms of reset.

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