Ibm uPD78082 Bedienungsanleitung PDF herunterladen (Seite 190)

167

CHAPTER 11 SERIAL INTERFACE CHANNEL 2

When the internal clock is used as the serial clock in the 3-wire serial I/O mode, set BRGC as described below.

BRGC Setting is not required if an external serial clock is used.

(i) When the baud rate generator is not used:

Select a serial clock frequency with TPS0-TPS3. Be sure then to set MDL0 to MDL3 to 1,1,1,1.

The serial clock frequency becomes the same as the source clock frequency for the 5-bit counter.

(ii) When the baud rate generator is used:

Select a serial clock frequency with TPS0-TPS3. Be sure then to set MDL0 to MDL3 to 1,1,1,1.

The serial clock frequency is calculated by the following formula:

Serial clock frequency= [H

Remarks 1. f

X : Main system clock oscillation frequency

2. f

XX : Main system clock frequency (fX or fX/2)

3. n : Value set in TPS0 to TPS3 (1 ≤ n ≤ 11)

4. k : Value set in MDL0 to MDL3 (0 ≤ k ≤ 14)

x (k + 16)

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Ibm uPD78082 Bedienungsanleitung Seite 190