SN250 datasheet(102/130 Pages) STMICROELECTRONICS

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Functional description—application modules

SN250

102/130

TMR2_CFG [0x458C]

TMR2_CNT [0x4580]

0-R

0-RW

TMR_EXTEN

TMR_EN

TMR_BIDIR

TMR_DOWN

TMR_1SHOT

TMR_PSCL

TMR_FILT

TMR_EDGE

TMR_CLK

0-RW

TMR_EXTEN

[12]

Control bit for the external enable mask on a pin. When this bit is clear, do not check

status of the TMR2ENMSK pin. When this bit is set, check status of the TMR2ENMSK

pin.

TMR_EN

[11]

Set this bit to enable counting. To change other register bits, this bit must be cleared.

TMR_BIDIR

[10]

Set this bit to enable bi-directional alternation mode.

TMR_DOWN

[9]

Initial count direction after enabling the timer. Clear this bit to count up; set this bit to

count down.

TMR_1SHOT

[8]

Clear this bit for auto repetition mode. Set this bit for a single shot.

TMR_PSCL

[7:4]

Clock divider setting (N). The possible clock divisors are: 0

− 2N (N = 0..10).

TMR_FILT

[3]

Set this bit to enable clock source glitch filtering.

TMR_EDGE

[2]

Clock source edge selection. Clear this bit for rising edge; set this bit for falling edge.

TMR_CLK

[1:0]

Clock source selection: 0 = calibrated RC oscillator (default); 1 = 32kHz; 2 = 12MHz;

3 = External (GPIO).

0-RW

TMR2_CNT

0-RW

TMR2_CNT

[15:0]

Current Timer 2 counter value. When read, returns the current timer counter. When

written, overwrites the timer counter and restarts wrap detection.

SN250 Datasheet(PDF) 102 Page - STMicroelectronics

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