78M6612 Data Sheet
DS_6612_001
Table 44: Available Circuit Functions
Circuit Function
System Power
MISSION
Yes
Battery Power (Non-volatile Supply)
BROWNOUT
LCD
SLEEP
CE
–
Yes
–
–
–
–
–
–
–
CE Data RAM
FIR
Yes
Yes
Analog circuits:
PLL, ADC, VREF, BME
etc
Yes
–
–
–
–
–
4.92 MHz
(from PLL)
28.672 kHz
MPU clock rate
(7/8 of 32768
Hz)
MPU_DIV
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
–
Yes
–
–
–
–
ICE
DIO Pins
Yes
–
–
Watchdog Timer
LCD
Yes
–
–
Yes
Yes
–
–
EEPROM Interface (2-wire)
EEPROM Interface (3-wire)
UART
Yes (8kb/s)
Yes (16kb/s)
Yes
–
–
–
–
–
Optical TX modulation
Flash Read
–
–
–
Yes
–
–
Flash Page Erase
Flash Write
Yes
–
–
–
–
–
RAM Read and Write
Wakeup Timer
Oscillator and RTC
DRAM data preservation
V3P3D voltage output pin
Yes
–
–
Yes
Yes
Yes
–
Yes
Yes
–
Yes
Yes
Yes
–
–
“—“ means “not active.
2.3.1 BROWNOUT Mode
In BROWNOUT mode, most non-measurement digital functions, as shown in Table 44, are active,
including ICE, UART, EEPROM, LCD, and RTC. In BROWNOUT mode, a low bias current regulator will
provide 2.5 Volts to V2P5 and V2P5NV. The regulator has an output called BAT_OK to indicate that it
has sufficient overhead. When BAT_OK = 0, the part will enter SLEEP mode. From BROWNOUT
mode, the MPU can voluntarily enter LCD or SLEEP modes. When system power is restored, the part
will automatically transition from any of the battery modes to mission mode, once the PLL has settled.
The MPU will run at crystal clock rate in BROWNOUT. The value of MPU_DIV will be remembered (not
changed) as the part enters and exits BROWNOUT. MPU_DIV will be ignored during BROWNOUT.
54
Rev. 1.2
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
