ST7232AK2-Auto STMicroelectronics, ST7232AK2-Auto Datasheet - Page 39

• Manufacturer Part Number: ST7232AK2-Auto
• Description: 8-bit MCU for automotive, 16 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMicroelectronics

Specifications of ST7232AK2-Auto

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: halt, active halt, wait and slow
• Main Clock Controller With: real time base, beep and clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST7232Axx-Auto
6.5.2
6.5.3
Figure 11. Reset sequence phases
Asynchronous external RESET pin
The RESET pin is both an input and an open-drain output with integrated R
resistor. This pull-up has no fixed value but varies in accordance with the input voltage. It
can be pulled low by external circuitry to reset the device. See
characteristics
A reset signal originating from an external source must have a duration of at least t
in order to be recognized (see
MCU can enter reset state even in halt mode.
Figure 12. Reset block diagram
The RESET pin is an asynchronous signal which plays a major role in EMS performance. In
a noisy environment, it is recommended to follow the guidelines mentioned in the electrical
characteristics section.
External power on reset
To start up the microcontroller correctly, the user must ensure by means of an external reset
circuit that the reset signal is held low until V
selected f
A proper reset signal for a slow rising V
RC network connected to the RESET pin.
RESET
OSC
frequency.
for more details.
Active phase
V
DD
R
ON
Figure
256 or 4096 CLOCK CYCLES
13). This detection is asynchronous and therefore the
Filter
DD
supply can generally be provided by an external
Internal reset
Reset
DD
is over the minimum level specified for the
Supply, reset and clock management
generator
Pulse
Section 12: Electrical
Fetch vector
Watchdog reset
ON
Internal reset
weak pull-up
h(RSTL)in
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