ST72324BJ6 STMicroelectronics, ST72324BJ6 Datasheet - Page 32

• Manufacturer Part Number: ST72324BJ6
• Description: 5V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
• Manufacturer: STMicroelectronics

Specifications of ST72324BJ6

• Hdflash Endurance: 1 kcycle at 55 °C, data retention 40 years at 85 °C
• Clock Sources: crystal/ceramic resonator oscillators, int. RC osc. and ext. clock input
• 4 Power Saving Modes: Slow, Wait, Active-halt, and Halt

Supply, reset and clock management
Figure 12. Clock, reset and supply block diagram
6.3
Caution:
6.3.1
32/193
RESET
OSC2
OSC1
V
V
DD
SS
Multi-oscillator (MO)
The main clock of the ST7 can be generated by three different source types coming from the
multi-oscillator block:
●
●
●
Each oscillator is optimized for a given frequency range in terms of consumption and is
selectable through the option byte. The associated hardware configurations are shown in
Table
The OSC1 and/or OSC2 pins must not be left unconnected. For the purposes of Failure
Mode and Effect Analysis, it should be noted that if the OSC1 and/or OSC2 pins are left
unconnected, the ST7 main oscillator may start and, in this configuration, could generate an
f
unsafe/undefined state. The product behavior must therefore be considered undefined when
the OSC pins are left unconnected.
External clock source
In this external clock mode, a clock signal (square, sinus or triangle) with ~50% duty cycle
has to drive the OSC1 pin while the OSC2 pin is tied to ground.
OSC
an external source
4 crystal or ceramic resonator oscillators
an internal high frequency RC oscillator
clock frequency in excess of the allowed maximum (> 16 MHz.), putting the ST7 in an
9. Refer to the electrical characteristics section for more details.
Reset sequence
oscillator
Multi-
(MO)
manager
(RSM)
f
OSC
(option)
PLL
SICSR
0
System integrity management
AVD AVD LVD
IE
AVD interrupt request
F
Auxiliary voltage
Low voltage
RF
detector
detector
(AVD)
(LVD)
0
0
0
WDG
f
RF
OSC2
Clock (MCC/RTC)
with Real-time
timer (WDG)
Main Clock
Watchdog
Controller
ST72324Bxx
f
CPU