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71M6533/G/H and 71M6534/H Data Sheet FDS_6533_6534_004

58 Rev 2

To facilitate transition to SLEEP mode, which is useful when an unprogrammed IC is mounted on a PCB

with a battery installed, the Teridian production test programs the following six-byte sequence into the

flash location starting at address 0x00000: 0x74 - 0x40 - 0x90 - 0x20 - 0xA9 - 0xF0. This sequence

decodes to the following assembler code:

0000: 7440 MOV A,#40 ; set bit 6 in accumulator

0002: 9020A9 MOV DPTR,#20A9 ; point to I/O RAM address 0x20A9

0005: F0 MOVX @DPTR,A ; set bit 6 (sleep) in 0x20A9

Transitions from both LCD and SLEEP mode are initiated by wake-up timer timeout conditions or

pushbutton events. When the PB pin is pulled high (pushbutton is pressed), the IE_PB interrupt flag (SFR

0xE8[4]) is set, and when the wake-up timer times out, the IE_WAKE interrupt flag (SFR 0xE8[5]) is set.

In the absence of system power, if the voltage margin for the LDO regulator providing 2.5 V to the internal

circuitry becomes too low to be safe, the part automatically enters SLEEP mode (BAT_OK false). The

battery voltage must stay above 3 V to ensure that BAT_OK remains true. Under this condition, the

71M6533 and 71M6534 stays in SLEEP mode, even if the voltage margin for the LDO improves (BAT_OK

true). Table 50 shows the circuit functions available in each operating mode.

Table 50: Available Circuit Functions

Circuit Function

System Power

Battery Power (Nonvolatile Supply)

MISSION

BROWNOUT

LCD

SLEEP

Yes

–

CE/MPU Data RAM

Yes

–

FIR

Yes

–

Analog circuits:

Yes

–

MPU clock rate

From PLL, as

defined by

MPU_DIV[2:0]

28.672 kHz

(7/8 of 32768 Hz)

– –

MPU_DIV

Yes

–

ICE

Yes

–

DIO Pins

Yes

–

Watchdog Timer

Yes

–

LCD

Yes

–

EEPROM Interface (2-wire)

Yes

Yes (8 kb/s)

–

EEPROM Interface (3-wire)

Yes

Yes (16 kb/s)

–

UART

Yes

300 bd

–

Optical TX modulation

Yes

–

Flash Read

Yes

–

Flash Page Erase

Yes

–

Flash Write

Yes

–

XRAM Read and Write

Yes

–

Wakeup Timer

Yes

Oscillator and RTC

Yes

XRAM data preservation

Yes

–

V3P3D voltage output pin

Yes

–

GPO – GP7 registers

Yes

– indicates not active