78M6612 Maxim, 78M6612 Datasheet - Page 17

• Manufacturer Part Number: 78M6612
• Description: The Teridian™ 78M6612 is a highly integrated, single-phase, power and energy measurement and monitoring system-on-chip (SoC) that includes a 32-bit compute engine (CE), an MPU core, RTC, and flash
• Manufacturer: Maxim

DS_6612_001
1.5.10 Hardware Watchdog Timer
1.5.11 Test Ports (TXUXOUT pin)
One out of 16 digital or 8 analog signals can be selected to be output on the TMUXOUT pin. The
function of the multiplexer is described in the applicable firmware documentation.
Rev 2
V3P3 - 10mV
400mV
V3P3 -
VBIAS
V3P3
0V
V1
operation,
enabled
Normal
Battery
WDT dis-
modes
WDT
abled
In addition to the basic watchdog timer included in the 80515 MPU, an
independent, robust, fixed-duration, watchdog timer (WDT) is included in
the device. It uses the crystal oscillator as its time base and must be
refreshed by the MPU firmware at least every 1.5 seconds. When not
refreshed on time the WDT overflows, and the part is reset as if the
RESET pin were pulled high, except that the I/O RAM bits will be
maintained. 4096 oscillator cycles (or 125 ms) after the WDT overflow,
the MPU will be launched from program address 0x0000. Asserting
ICR_E will deactivate the WDT.
The WDT can also be disabled by tying the V1 pin to V3P3. Of course,
this also deactivates V1 power fault detection. Since there is no method
in firmware to disable the crystal oscillator or the WDT, it is guaranteed
that whatever state the part might find itself in, upon WDT overflow, the
part will be reset to a known state.
Figure 4: Functions Defined by V1
78M6612 Data Sheet
17