ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 65

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST72324B
10.2.2
Caution:
10.2.3
10.2.4
Clock-out capability
The clock-out capability is an alternate function of an I/O port pin that outputs the f
to drive external devices. It is controlled by the MCO bit in the MCCSR register.
When selected, the clock out pin suspends the clock during Active Halt mode.
Real-time clock (RTC) timer
The counter of the real-time clock timer allows an interrupt to be generated based on an
accurate real-time clock. Four different time bases depending directly on f
The whole functionality is controlled by four bits of the MCCSR register: TB[1:0], OIE and
OIF.
When the RTC interrupt is enabled (OIE bit set), the ST7 enters Active Halt mode when the
HALT instruction is executed. See
more details.
Beeper
The beep function is controlled by the MCCBCR register. It can output three selectable
frequencies on the Beep pin (I/O port alternate function).
Figure 35. Main clock controller (MCC/RTC) block diagram
f
OSC2
MCCBCR
MCCSR
Div 2, 4, 8, 16
MCO
CP1 CP0
Div 64
SMS
1
0
Section 8.4: Active Halt and Halt modes on page 49
12-bit MCC RTC
TB1 TB0 OIE OIF
Beep signal
BC1 BC0
selection
counter
MCC/RTC interrupt
f
CPU
Watchdog
timer
To
On-chip peripherals
OSC2
to CPU and
peripherals
Beep
MCO
CPU clock
are available.
CPU
65/188
clock
for