ST72C334N2B6 STMicroelectronics, ST72C334N2B6 Datasheet - Page 34

• Manufacturer Part Number: ST72C334N2B6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2B6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 44
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: SDIP-56
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: No

ST72334J/N, ST72314J/N, ST72124J
4.5 MAIN CLOCK CONTROLLER (MCC)
The MCC block supplies the clock for the ST7
CPU and its internal peripherals. It allows to man-
age the power saving modes such as the SLOW
and ACTIVE-HALT modes. The whole functionali-
ty is managed by the Main Clock Control/Status
Register (MCCSR) and the Miscellaneous Regis-
ter 1 (MISCR1).
The MCC block consists of:
The prescaler allows to select the main clock fre-
quency and is controlled with three bits of the
MISCR1: CP1, CP0 and SMS.
Figure 25. Main Clock Controller (MCC) Block Diagram
34/125
– a programmable CPU clock prescaler
– a time base counter with interrupt capability
– a clock-out signal to supply external devices
OSC2
OSC1
MCO
ALTERNATE
FUNCTION
PORT
OSCILLATOR
MCCSR
MCC INTERRUPT
0
PERIPHER ALS
0
TO CPU AND
CPU CLOCK
f
OSC
MISCR1
0
The counter allows to generate an interrupt based
on a accurate real time clock. Four different time
bases depending directly on f
The whole functionality is controlled by four bits of
the MCCSR register: TB1, TB0, OIE and OIF.
The clock-out capability allows to configure a ded-
icated I/O port pin as an f
external devices. It is controlled by the MCO bit in
the MISCR1 register.
When selected, the clock out pin suspends the
clock during ACTIVE-HALT mode.
0
PROGRAMMABLE
-
TB1
DIVIDER
DIV 2
-
TB0
MCO
OIE
-
OIF
f
-
f
OSC
CPU
OSC
DIV 2, 4, 8, 16
/2
CP1
/2 clock out to drive
OSC
CP0
are available.
SMS
MCC