PS700 datasheet(30/38 Pages) MICROCHIP

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PS700

DS21760F-page 30

 2004 Microchip Technology Inc.

VREFT: VOLTAGE REFERENCE TRIM REGISTER

(ADDRESS 82 HEX/130 DECIMAL)

MOsct: MAIN OSCILLATOR TRIM REGISTER (ADDRESS 83 HEX/131 DECIMAL)

AOsct: AUXILIARY OSCILLATOR TRIM REGISTER

(ADDRESS 86 HEX/134 DECIMAL)

GPIOen1

GPIOen0

VREFT

bit 7

bit 0

bit 7

GPIOen1: Enable VCELL2 as GPIO bit

Writing this bit to a ‘1’ will configure the VCELL2 pin as a GPIO. If enabled as GPIO, the

accumulation function in the Accumctrl register and the trip function in the TRIPctrl register

should be disabled.

bit 6

GPIOen0: Enable NTC as GPIO bit

Writing this register to a ‘1’ will configure the NTC pin as a GPIO. If enabled as GPIO, the

accumulation function in the Accumctrl register should be disabled.

bit 5-0

VREFT: Voltage Reference Trim bits

Bits 5-0 of this register store the trim value for both the +340 mV and +170 mV references. This

value is factory programmed.

Legend:

‘1’ = Bit is set

‘0’ = Bit is cleared

R = Reserved bit

ROSC_sel

MOsct

bit 7

bit 0

bit 7

ROSC_sel: Resistor Oscillator Select bit

Writing this register to a ‘1’ requires the use of a low temperature coefficient 221 k

Ω resistor on

the ROSC pin. Writing this register to a ‘0’ will allow the use of an internal 221 k

Ω resistor. (The

precision of the internal time base will be affected by the selection of the resistor with the lowest

variance of resistance over the systems operating range.)

bit 6-0

MOsct: Main Oscillator Trim bits

Bits 0-6 of this register are used to trim the internal time base. This value is factory programmed.

Legend:

‘1’ = Bit is set

‘0’ = Bit is cleared

R = Reserved bit

Reserved

AOsct

bit 7

bit 0

bit 7-5

Reserved: Reserved bit location

bit 4-0

AOsct: Auxiliary Oscillator Trim bits

Trim bits for the secondary oscillator used in low-power modes.

Legend:

‘1’ = Bit is set

‘0’ = Bit is cleared

R = Reserved bit

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