ST72104G, ST72215G, ST72216G, ST72254G
7.6 MAIN CLOCK CONTROLLER (MCC)
The Main Clock Controller (MCC) supplies the
clock for the ST7 CPU and its internal peripherals.
It allows SLOW power saving mode to be man-
aged by the application.
The prescaler allows the selection of the main
clock frequency and is controlled by three bits of
the MISCR1: CP1, CP0 and SMS.
The clock-out capability consists of a dedicated
All functions are managed by the Miscellaneous
register 1 (MISCR1).
I/O port pin configurable as an f
drive external devices. It is controlled by the MCO
bit in the MISCR1 register.
clock output to
CPU
The MCC block consists of:
■ A programmable CPU clock prescaler
■ A clock-out signal to supply external devices
See Section 11 "MISCELLANEOUS REGIS-
TERS" on page 36 for more details.
Figure 14. Main Clock Controller (MCC) Block Diagram
CLOCK TO CAN
PERIPHERAL
PORT
ALTERNATE
FUNCTION
MCO
f
/2
OSC
MISCR1
-
-
MCO
-
-
CP1 CP0 SMS
f
OSC
DIV 2, 4, 8, 16
DIV 2
CPU CLOCK
TO CPU AND
PERIPHERALS
f
CPU
24/140
ETC [ ETC ]
