AM8530H AMD [Advanced Micro Devices], AM8530H Datasheet - Page 101

• Manufacturer Part Number: AM8530H
• Description: Serial Communications Controller
• Manufacturer: AMD [Advanced Micro Devices]

Support Circuitry Programming
If neither the transmit clock nor the receive clock is programmed to come from the TRxC
pin, the output of the BRG may be made available for external use on the TRxC pin.
Figure 5–2 shows a block diagram of the BRG. The BRG input comes from the output of
a two-input multiplexer, and the zero count condition is outputed to the External/Status
Interrupt section. The BRG may be disabled and enabled by command and is disabled by
a hardware reset.
Counter
Write to
Source
WR14
Clock
Clock
RTxC Pin
PCLK Pin
WR13
End of Write to WR14 with Enable
Figure 5–2. Baud Rate Generator
Select
16 Bit Down Counter
Figure 5–3. BRG Startup
Baud Rate
Generator
Clock
Counter First Decremented
(After Previous Disable)
WR12
Counter First Decremented
(After Hardware Reset)
2
Zero Count
AMD
Output
5–7