ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 81

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72521xx-Auto
10.4
Caution:
Figure 31. Watchdog block diagram
How to program the watchdog timeout
Figure 32
Watchdog Counter (CNT) and the resulting timeout duration in milliseconds. This can be
used for a quick calculation without taking the timing variations into account. If more
precision is needed, use the formulae in
When writing to the WDGCR register, always write 1 in the T6 bit to avoid generating an
immediate reset.
Figure 32. Approximate timeout duration
MCC/RTC
11
3F
38
30
28
20
18
10
08
00
MSB
shows the linear relationship between the 6-bit value to be loaded in the
1.5
RTC COUNTER
12-BIT MCC
f
DIV 64
OSC2
6
5
18
LSB
0
TB[1:0] bits
(MCCSR
Register)
34
Watchdog timeout (ms) @ 8 MHz f
Doc ID 17660 Rev 1
50
Figure
WDGA
33.
RESET
65
T6
WATCHDOG CONTROL REGISTER (WDGCR)
T5
82
OSC2
WDG PRESCALER
6-BIT DOWNCOUNTER (CNT)
T4
DIV 4
Watchdog timer (WDG)
98
T3
T2
114
T1
128
81/276
T0