ST72321M6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST72321M6
STMicroelectronics
'ST72321M6' PDF : 175 Pages View PDF
ST72321M6 ST72321M9
MAIN CLOCK CONTROLLER WITH REAL-TIME CLOCK (Cont’d)
Bit 0 = OIF Oscillator interrupt flag
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.
MCC BEEP CONTROL REGISTER (MCCBCR)
Read / Write
Reset Value: 0000 0000 (00h)
7
0
0
0
0
0
0
0 BC1 BC0
Bit 7:2 = Reserved, must be kept cleared.
Bit 1:0 = BC[1:0] Beep control
These 2 bits select the PF1 pin beep capability.
BC1 BC0
Beep mode with fOSC2=8 MHz
0
0
Off
0
1
1
0
1
1
~2 kHz
~1 kHz
~500 Hz
Output
Beep signal
~50% duty cycle
The beep output signal is available in Active-halt
mode but has to be disabled to reduce the con-
sumption.
Table 13. Main Clock Controller Register Map and Reset Values
Address
(Hex.)
Register
Label
7
6
5
4
3
2
1
0
002Bh
SICSR
Reset Value
AVDS
0
AVDIE
0
AVDF LVDRF
0
x
0
0
WDGRF
0
x
002Ch
MCCSR
Reset Value
MCO
0
CP1
0
CP0
0
SMS
0
TB1
0
TB0
0
OIE
0
OIF
0
002Dh
MCCBCR
Reset Value
0
0
0
0
0
BC1
BC0
0
0
0
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