EM78P510N
8-Bit Microcontrollers
6.11.4 Baud Rate Generator
The baud rate generator is comprised of a circuit that generates a clock pulse to
determine the transfer speed for transmission/reception in the UART.
The BRATE2~BRATE0 bits of the URC register can determine the desired baud rate.
6.11.5 UART Timing
1. Transmission Counter Timing:
1
2
3
4
5
6
7
8
9
10 11
12 13 14 15 16
1
2
3
4
TSYSTEM/16
One bit cycle
Start bit
Bit 0
TXD pin
2. Receiving Counter Timing:
Synchronization
(Reset counter)
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
1
2
3
4
12 13
T
SYSTEM/16
One bit cycle
Start bit
Bit 0
Stop bit
RXD pin
Sampling
Timing
3. UART Transmit operation (8 bits data with parity bit):
START
bit
Parity STOP
bit bit
START
bit
D
0
D1
D2
Dn
D0
D1
D2
.
TXD
pin
Clear by hardware when
write data into
UARTTx
And start transmitting.
UTBE
Clear by
software
URTIF
Product Specification (V0.9) 09.12.2006
(This specification is subject to change without further notice)
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ELAN [ ELAN MICROELECTRONICS CORP ]
