ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 88

• 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)
11.8.2
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Table 40.
Table 41.
MCC beep control register (MCCBCR)
Table 42.
Table 43.
The beep output signal is available in Active Halt mode but has to be disabled to reduce
consumption.
MCCBCR
Counter prescaler
Bit
Bit
7:2
1:0 BC[1:0]
0
7
BC1
200000
Name
16000
32000
80000
Name
0
0
1
1
OIF
-
MCCSR register description (continued)
Time base selection
MCCBCR register description
Beep frequency selection
Oscillator interrupt flag
Reserved, must be kept cleared.
Beep control
This bit is set by hardware and cleared by software reading the MCCSR register. It
indicates when set that the main oscillator has reached the selected elapsed time
(TB1:0).
0: Timeout not reached
1: Timeout reached
Caution: The BRES and BSET instructions must not be used on the MCCSR
register to avoid unintentionally clearing the OIF bit.
These 2 bits select the PF1 pin beep capability (see
6
BC0
0
1
0
1
f
OSC2
5
20ms
50ms
4ms
8ms
Reserved
Doc ID 17660 Rev 1
= 4 MHz
-
Time base
4
~500 Hz
~1 kHz
~2 kHz
Beep mode with f
Function
Function
f
OSC2
3
10ms
25ms
2ms
4ms
= 8 MHz
Off
2
OSC2
Table
Reset value: 0000 0000 (00h)
= 8 MHz
43).
~50% duty cycle
Beep signal
TB1
0
0
1
1
Output
1
ST72521xx-Auto
BC[1:0]
RW
TB0
0
1
0
1
0