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| 型号： | USB-I2C/LIN-CONV-Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 74/104页 |
| 文件大小： | 0K |
| 描述： | USB TO I2C/LIN CONV BOARD |
| 标准包装： | 1 |
| 附件类型： | 适配器板 |
| 适用于相关产品： | ARM7TDMI? |
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Data Sheet
ADuC7019/20/21/22/24/25/26/27/28/29
Rev. F | Page 71 of 104
The serial communication adopts an asynchronous protocol,
which supports various word lengths, stop bits, and parity
generation options selectable in the configuration register.
Baud Rate Generation
There are two ways of generating the UART baud rate, normal
450 UART baud rate generation and the fractional divider.
Normal 450 UART Baud Rate Generation
The baud rate is a divided version of the core clock using the values
in the COMDIV0 and COMDIV1 MMRs (16-bit value, DL).
DL
×
2
×
16
-
2
MHz
78
.
41
=
Rate
Baud
CD
Table 93 gives some common baud rate values.
Table 93. Baud Rate Using the Normal Baud Rate Generator
Baud Rate
CD
DL
Actual Baud Rate
% Error
9600
0
0x88
9600
0
19,200
0
0x44
19,200
0
115,200
0
0x0B
118,691
3
9600
3
0x11
9600
0
19,200
3
0x08
20,400
6.25
115,200
3
0x01
163,200
41.67
Fractional Divider
The fractional divider, combined with the normal baud rate
generator, produces a wider range of more accurate baud rates.
04955-
032
/16DL
UART
FBEN
CORE
CLOCK
/2
/(M+N/2048)
Figure 75. Baud Rate Generation Options
Calculation of the baud rate using fractional divider is as follows:
+
×
=
2048
2
16
2
MHz
78
.
41
N
M
DL
Rate
Baud
CD
2
×
DL
×
16
×
2
×
Rate
Baud
MHz
78
.
41
=
2048
N
+
M
CD
For example, generation of 19,200 baud with CD bits = 3
(Table 93 gives DL = 0x08) is
2
8
16
2
19200
MHz
78
.
41
2048
3
×
=
+ N
M
06
.
1
2048
=
+ N
M
where:
M = 1
N = 0.06 × 2048 = 128
2048
128
×
2
×
8
×
16
×
2
MHz
78
.
41
=
Rate
Baud
3
where:
Baud Rate = 19,200 bps
Error = 0%, compared to 6.25% with the normal baud rate
generator.
UART Register Definitions
The UART interface consists of 12 registers: COMTX, COMRX,
COMDIV0, COMIEN0, COMDIV1, COMIID0, COMCON0,
COMCON1, COMSTA0, COMSTA1, COMSCR, and
COMDIV2.
Table 94. COMTX Register
Name
Address
Default Value
Access
COMTX
0xFFFF0700
0x00
R/W
COMTX is an 8-bit transmit register.
Table 95. COMRX Register
Name
Address
Default Value
Access
COMRX
0xFFFF0700
0x00
R
COMRX is an 8-bit receive register.
Table 96. COMDIV0 Register
Name
Address
Default Value
Access
COMDIV0
0xFFFF0700
0x00
R/W
COMDIV0 is a low byte divisor latch. 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.
Table 97. COMIEN0 Register
Name
Address
Default Value
Access
COMIEN0
0xFFFF0704
0x00
R/W
COMIEN0 is the interrupt enable register.
Table 98. COMIEN0 MMR Bit Descriptions
Bit
Name
Description
7:4
N/A
Reserved.
3
EDSSI
Modem status interrupt enable bit. Set by
user to enable generation of an interrupt if
any of COMSTA1[3:1] is set. Cleared by user.
2
ELSI
Rx status interrupt enable bit. Set by user to
enable generation of an interrupt if any of
COMSTA0[4:1] is set. Cleared by user.
1
ETBEI
Enable transmit buffer empty interrupt. Set
by user to enable interrupt when buffer is
empty during a transmission. Cleared by user.
0
ERBFI
Enable receive buffer full interrupt. Set by
user to enable interrupt when buffer is full
during a reception. Cleared by user.
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