71M6541DSLASHFSLASHG datasheet(125/166 Pages) MAXIM

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71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

125

Name

Location

Rst Wk

Dir

Description

VSTAT[2:0]

SFR F9[2:0]

–

This word describes the source of power and the status of the VDD.

VSTAT Description

000

System Power OK. V3P3A>3.0v. Analog modules are functional

and accurate. [V3AOK,V3OK] = 11

001

System Power Low. 2.8v<V3P3A<3.0v. Analog modules not

accurate. Switch over to battery power is imminent.

[V3AOK,V3OK] = 01

010

Battery power and VDD OK. VDD>2.25v. Full digital functionality.

[V3AOK,V3OK] = 00, [VDDOK,VDDgt2] = 11

011

Battery power and VDD>2.0. Flash writes are inhibited. If the

TRIMVDD[5] fuse is blown, PLL_FAST (I/O RAM 0x2200[4]) is

cleared.

[V3AOK,V3OK] = 00, [VDDOK,VDDgt2] = 01

101

Battery power and VDD<2.0. When VSTAT=101, processor is

nearly out of voltage. Processor failure is imminent.

[V3AOK,V3OK] = 00, [VDDOK,VDDgt2] = 00

WAKE_ARM

28B2[5]

–

R/W

Arms the WAKE timer and loads it with WAKE_TMR[7:0]. When SLEEP or

LCD_ONLY is asserted by the MPU, the WAKE timer becomes active.

WAKE_TMR[7:0]

2880[7:0]

–

R/W Timer duration is WAKE_TMR+1 seconds.

WD_RST

28B4[7]

Reset the WD timer. The WD is reset when a 1 is written to this bit. Writing a

one clears and restarts the watch dog timer.

WF_DIO4

28B1[2]

–

DIO4 wake flag bit. If DIO4 is configured to wake the part, this bit is set

whenever the de-bounced version of DIO4 rises. It is held in reset if DI04 is

not configured for wakeup.

WF_DIO52

28B1[1]

–

DIO52 wake flag bit. If DIO52 is configured to wake the part, this bit is set

whenever the de-bounced version of DIO52 rises. It is held in reset if DI052 is

not configured for wakeup.

WF_DIO55

28B1[0]

–

DIO55 wake flag bit. If DIO55 is configured to wake the part, this bit is set

whenever the de-bounced version of DIO55 rises. It is held in reset if DI055 is

not configured for wakeup.

WF_TMR

28B1[5]

–

Indicates that the wake timer caused the part to wake up.

WF_PB

28B1[3]

–

Indicates that the PB caused the part to wake.

WF_RX

28B1[4]

–

Indicates that RX caused the part to wake.

WF_CSTART

WF_RST

WF_RSTBIT

WF_OVF

WF_ERST

WF_BADVDD

28B0[7]

28B0[6]

28B0[5]

28B0[4]

28B0[3]

28B0[2]

–

Indicates that the Reset pin, Reset bit, ERST pin, Watchdog timer, the cold

start detector, or bad VBAT caused the part to reset.

71M6541D/F/G Datasheet(PDF) 125 Page - Maxim Integrated Products

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