ST72561J9-Auto STMicroelectronics, ST72561J9-Auto Datasheet - Page 86

• Manufacturer Part Number: ST72561J9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72561J9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years at 55 °C
• 5 Power Saving Modes: halt, auto wake up from halt, active halt, wait and slow

Window watchdog (WWDG)
9.6
Table 36.
9.7
86/324
SLOW
WAIT
HALT
ACTIVE
HALT
Mode
No effect on Watchdog: the downcounter continues to decrement at normal speed.
No effect on Watchdog: the downcounter continues to decrement.
OIE bit in
Figure 37. Window watchdog timing diagram
Low power modes
Effect of low power modes on WDG
Hardware watchdog option
If Hardware Watchdog is selected by option byte, the watchdog is always active and the
WDGA bit in the WDGCR is not used. Refer to the Option Byte description.
MCCSR
register
0
0
1
bit in Option
WDGHALT
Byte
0
1
x
WDGWR
3Fh
T6 bit
Reset
T[5:0] CNT downcounter
No Watchdog reset is generated. The MCU enters Halt mode. The
Watchdog counter is decremented once and then stops counting and is
no longer able to generate a watchdog reset until the MCU receives an
external interrupt or a reset.
If an interrupt is received (refer to interrupt table mapping to see
interrupts which can occur in halt mode), the Watchdog restarts counting
after 256 or 4096 CPU clocks. If a reset is generated, the Watchdog is
disabled (reset state) unless Hardware Watchdog is selected by option
byte. For application recommendations see
mode with the WDG (WDGHALT option)
A reset is generated instead of entering halt mode.
No reset is generated. The MCU enters Active Halt mode. The
Watchdog counter is not decremented. It stop counting. When the MCU
receives an oscillator interrupt or external interrupt, the Watchdog
restarts counting immediately. When the MCU receives a reset the
Watchdog restarts counting after 256 or 4096 CPU clocks.
Doc ID 12370 Rev 8
Refresh not allowed
Description
Refresh Window
(step = 16384/f
time
below.
Section 9.8: Using halt
OSC2
)
ST72561-Auto