Rainbow-electronics T89C5115 Uživatelský manuál stáhnout pdf (Strana 15)

T89C5115

4128A–8051–04/02

Figure 4. Mode Switching Waveforms

Note: In order to prevent any incorrect operation while operating in the X2 mode, users must be aware that all peripherals using the

clock frequency as a time reference (UART, timers...) will have their time reference divided by two. For example a free running

timer generating an interrupt every 20 ms will then generate an interrupt every 10 ms. A UART with a 4800 baud rate will have

a 9600 baud rate.

XTAL2

XTAL1

CPU

clock

X2 bit

Mode

STD

Mode

STD

Mode

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 104 105

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Rainbow-electronics T89C5115 Uživatelský manuál Strana 15