Siemens EF 88H Series Bedienungsanleitung PDF herunterladen (Seite 68)

Semiconductor Group 6-34

On-Chip Peripheral Components

C501

6.3.3.2 Using Timer 2 to Generate Baud Rates

Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON. Note then

the baud rates for transmit and receive can be simultaneously different. Setting RCLK and/or TCLK

puts timer 2 into its baud rate generator mode, as shown in figure 6-18.

Figure 6-18

Timer 2 in Baud Rate Generator Mode

The baud rate generator mode is similar to the auto-reload mode, in that rollover in TH2 causes the

timer 2 registers to be reloaded with the 16-bit value in registers RC2H and RC2L, which are preset

by software.

Now the baud rates in modes 1 and 3 are determined by timer 2’s overflow rate as follows:

Modes 1, 3 baud rate = timer 2 overflow rate/16

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 120 121

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Siemens EF 88H Series Bedienungsanleitung Seite 68