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ADuC7060
UART SERIAL INTERFACE
The ADuC7060 features a 16,450-compatible UART. The UART
is a full-duplex, universal, asynchronous receiver/transmitter. A
Calculation of the baud rate using a fractional divider is as
follows:
M +
=
16 × DL × 2 × ( M +
UART performs serial-to-parallel conversion on data characters
received from a peripheral device and parallel-to-serial conversion
on data characters received from the ARM7TDMI. The UART
features a fractional divider that facilitates high accuracy baud
rate generation and a network addressable mode. The UART
functionality is available on the P1.0/IRQ1/SIN/T0 and
Baud Rate =
N
2048
10 . 24 MHz
N
2048
10 . 24 MHz
Baud Rate × 16 × DL × 2
)
(2)
P1.1/SOUT pins of the ADuC7060.
The serial communication adopts an asynchronous protocol
that supports various word length, stop bits, and parity genera-
Table 86 lists common baud rate values.
Table 86. Baud Rate Using the Fractional Baud Rate Generator
tion options selectable in the configuration register.
BAUD RATE GENERATION
The ADuC7060 features two methods of generating the UART
baud rate: normal 450 UART baud rate generation and
Baud
Rate
9600
19,200
115,200
CD
0
0
0
DL
0x21
0x10
0x2
M
1
1
1
N
21
85
796
Actual
Baud Rate
9598.55
19,203
115,218
% Error
0.015%
0.015%
0.015%
ADuC7060 fractional divider.
Normal 450 UART Baud Rate Generation
The baud rate is a divided version of the core clock using the
value in COMDIV0 and COMDIV1 MMRs (16-bit value, DL).
The standard baud rate generator formula is
UART REGISTER DEFINITION
The UART interface consists of the following nine registers:
COMTX: 8-bit transmit register
COMRX: 8-bit receive register
Baud Rate =
10 . 24 MHz
16 × 2 × DL
(1)
COMDIV0: divisor latch (low byte)
COMDIV1: divisor latch (high byte)
Table 85 lists common baud rate values.
Table 85. Baud Rate Using the Standard Baud Rate Generator
COMCON0: line control register
COMSTA0: line status register
COMIEN0: interrupt enable register
Baud Rate
9600
19,200
115,200
9600
19,200
CD
0
0
0
3
3
DL
0x21
0x11
0x3
0x4
0x2
Actual Baud Rate
9696
18,824
106,667
10,000
20,000
% Error
1.01%
1.96%
7.41%
4.17%
4.17%
COMIID0: interrupt identification register
COMDIV2: 16-bit fractional baud divide register
COMTX, COMRX, and COMDIV0 share the same address
location. COMTX and COMRX can be accessed when Bit 7 in
the COMCON0 register is cleared. COMDIV0 can be accessed
when Bit 7 of COMCON0 is set.
ADuC7060 Fractional Divider
The fractional divider combined with the normal baud rate
generator allows the generation of accurate high speed baud rates.
CORE
CLOCK
/2
FBEN
/16DL
UART
/(M + N/2048)
Figure 26. Fractional Divider Baud Rate Generation
Rev. 0 | Page 75 of 100
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