ST52T430K3M6 STMicroelectronics, ST52T430K3M6 Datasheet - Page 31

• Manufacturer Part Number: ST52T430K3M6
• Manufacturer: STMicroelectronics

Specifications of ST52T430K3M6

• Cpu Family: ST52
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SCI/UART
• Program Memory Type: EPROM
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5/5.8V
• Operating Supply Voltage (min): 2.7/3V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 34
• Package Type: SSO
• Lead Free Status / Rohs Status: Not Compliant

and the watchdog remain active. During WAIT
mode, Interrupts are enabled. The MCU will
remain in Wait mode until an Interrupt or a RESET
occurs, whereupon the Program Counter jumps to
the interrupt service routine or, if a RESET occurs,
at the beginning of the user program.
REMARK: In Wait mode the CPU clock does not
stop.
5.3.2 Halt Mode
Halt mode is MCU’s lowest power consumption
mode, which is entered by executing the HALT
instruction. The internal oscillator is turned off,
causing all internal processing to stop, including
the operations of the on-chip peripherals.
Figure 5.2 Reset Block Diagram
Figure 5.3 Simple Reset Circuit
RESET
Vcc
100
F
WATCHDOG RESET
2.2k
10k
2.2k
1 F
RESET
INTERNAL
RESET
Halt mode cannot be used when the watchdog
is enabled.
If the HALT instruction is executed while the
watchdog system is enabled, it will be skipped
without modifying the normal CPU operations.
The ICU can exit Halt mode after an external inter-
rupt or reset. The oscillator is then turned on and
stabilization time is provided before restarting
CPU operations. Stabilization time is 4096 CPU
clock cycles after the interrupt and 1.000.000 after
the Reset.
After the start up delay, the CPU restarts opera-
tions by serving the external interrupt routine.
Reset makes the ICU exit from HALT mode and
restart, after the delay, from the beginning of the
user program after the delay.
Warning: if the External Interrupt is disabled, the
ICU exits from the Halt mode and jumps to the
lower priority interrupt routine.
Figure 5.4 WAIT Flow Chart
ST52T430/E430
31/85