at94k05al-25aqi ATMEL Corporation, at94k05al-25aqi Datasheet - Page 119

• Manufacturer Part Number: at94k05al-25aqi
• Description: 5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
• Manufacturer: ATMEL Corporation

UARTs
Data Transmission
Rev. 1138F–FPSLI–06/02
The FPSLIC features two full duplex (separate receive and transmit registers) Universal Asyn-
chronous Receiver and Transmitter (UART). The main features are:
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A block schematic of the UART transmitter is shown in Figure 64. The two UARTs are identical
and the functionality is described in general for the two UARTs.
Figure 64. UART Transmitter
Note:
XTAL
Baud-rate Generator Generates any Baud-rate
High Baud-rates at Low XTAL Frequencies
8 or 9 Bits Data
Noise Filtering
Overrun Detection
Framing Error Detection
False Start Bit Detection
Three Separate Interrupts on TX Complete, TX Data Register Empty and RX Complete
Multi-processor Communication Mode
Double Speed UART Mode
1. n = 0, 1
CONTROL LOGIC
GENERATOR
BAUD RATE
STORE UDRn
SHIFT ENABLE
BAUD x 16
IDLE
(1)
UART CONTROL AND
STATUS REGISTER
/16
DATA BUS
BAUD
(UCSRnB)
DATA BUS
REGISTER (UDRn)
SHIFT REGISTER
UART I/O DATA
10(11)-BIT TX
AT94K Series FPSLIC
UART CONTROL AND
TXCn
STATUS REGISTER
IRQ
(UCSRnA)
UDREn
IRQ
TXDn
PIN CONTROL
LOGIC
PE0/
PE2
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