ST72344K2 datasheet(97/247 Pages) STMICROELECTRONICS

Numer części	ST72344K2

Szczegółowy opis	SCI asynchronous serial interface

PDF	247 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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97 / 247 page

ST72344xx, ST2345xx

On-chip peripherals

Doc ID 12321 Rev 6

97/247

A minimum of four falling edges of the CPU clock must occur between two consecutive

active edges of the external clock; thus, the external clock frequency must be less than a

quarter of the CPU clock frequency.

Figure 44.

Counter timing diagram, internal clock divided by 2

Figure 45.

Counter timing diagram, internal clock divided by 4

Figure 46.

Counter timing diagram, internal clock divided by 8

Note:

The device is in reset state when the internal reset signal is high. When it is low, the Device

is running.

CPU CLOCK

FFFD FFFE FFFF 0000

0001

0002

0003

INTERNAL RESET

TIMER CLOCK

COUNTER REGISTER

TIMER OVERFLOW FLAG (TOF)

FFFC

FFFD

0000

0001

CPU CLOCK

INTERNAL RESET

TIMER CLOCK

COUNTER REGISTER

TIMER OVERFLOW FLAG (TOF)

CPU CLOCK

INTERNAL RESET

TIMER CLOCK

COUNTER REGISTER

TIMER OVERFLOW FLAG (TOF)

FFFC

FFFD

0000

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