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Advance Information
UM-TM57PE10_E
8-Bit Microcontroller
14
tenx technology inc.
Preliminary
Rev 1.4, 2012/01/19
2. Chip Operation Mode
2.1 Reset
The TM57PE10 can be RESET in four ways.
-
Power-On-Reset
-
Low Voltage Reset (LVR)
-
External Pin Reset (PA7)
-
Watchdog Reset (WDT)
After Power-On-Reset, all system and peripheral control registers are then set to their default hardware
Reset values. The clock source, LVR level and chip operation mode are selected by the SYSCFG
register value. The Low Voltage Reset features static reset when supply voltage is below a threshold
level. There are two threshold levels can be selected. The LVR’s operation mode is defined by the
SYSCFG register.
There are two voltage selections for the LVR threshold level, one is higher level which is suitable for
application with V
DD
is more than 3.3V, while another one is suitable for application with V
DD
is less than
3.3V. See the following LVR Selection Table; user must also consider the lowest operating voltage of
operating frequency.
LVR Selection Table:
LVR Threshold Level
Consider the operating voltage to choose LVR
LVR2.3
5.5V > V
DD
> 3.3V
LVR1.5
V
DD
is wide voltage range
The External Pin Reset and Watchdog Reset can be disabled or enabled by the SYSCFG
register. These two resets also set all the control registers to their default reset value. The
TO/PD flag is not affected by these resets.