ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 86

• 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

Main clock controller with real-time clock and beeper (MCC/RTC)
Figure 34. Main clock controller (MCC/RTC) block diagram
11.6
11.7
86/276
f
OSC2
MCCBCR
Low power modes
Table 38.
Interrupts
The MCC/RTC interrupt event generates an interrupt if the OIE bit of the MCCSR register is
set and the interrupt mask in the CC register is not active (RIM instruction).
Table 39.
1. The MCC/RTC interrupt wakes up the MCU from Active Halt mode, not from Halt mode.
Active Halt
Time base overflow event
MCCSR
Mode
Wait
Halt
MCO
DIV 2, 4, 8, 16
Interrupt event
Effect of low power modes on MCC/RTC
MCC/RTC interrupt control/wake-up capability
CP1
DIV 64
CP0
No effect on MCC/RTC peripheral.
MCC/RTC interrupt causes the device to exit from Wait mode.
No effect on MCC/RTC counter (OIE bit is set), the registers are frozen.
MCC/RTC interrupt causes the device to exit from Active Halt mode.
MCC/RTC counter and registers are frozen.
MCC/RTC operation resumes when the MCU is woken up by an interrupt with
“exit from HALT” capability.
SMS
1
0
BEEP SIGNAL
12-BIT MCC RTC
TB1
SELECTION
Doc ID 17660 Rev 1
COUNTER
BC1
TB0
BC0
Event flag
OIE
OIF
OIF
control bit
MCC/RTC INTERRUPT
Effect
Enable
OIE
f
CPU
WATCHDOG
TIMER
TO
Exit from
Wait
Yes
ST72521xx-Auto
PERIPHERALS
BEEP
MCO
TO CPU AND
CPU CLOCK
Exit from
No
Halt
(1)