参数资料
型号: ADUC7121BBCZ
厂商: Analog Devices Inc
文件页数: 53/96页
文件大小: 0K
描述: IC ARM7TDMI MCU 126KB 108CSPBGA
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 41.78MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 126KB(63K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 9x12b,D/A 4x12b
振荡器型: 内部
工作温度: -10°C ~ 95°C
封装/外壳: 108-LFBGA,CSPBGA
包装: 托盘
Data Sheet
ADuC7121
Rev. B | Page 57 of 96
UART SERIAL INTERFACE
The ADuC7121 features a 16,450-compatible UART. The UART
is a full-duplex, universal, asynchronous receiver/transmitter. A
UART performs serial-to-parallel conversion on data characters
received from a peripheral device, and parallel-to-serial conver-
sion on data characters received from the ARM7TDMI. The
UART features a fractional divider that facilitates high accuracy
baud rate generation. The UART functionality is available on
the P1.0/SIN/SCL1/PLAI[7] and P1.1/SOUT/SDA1/PLAI[6]
pins of the ADuC7121.
The serial communication adopts an asynchronous protocol
that supports various word length, stop bits, and parity genera-
tion options selectable in the configuration register.
BAUD RATE GENERATION
The ADuC7121 features two methods of generating the UART
baud rate: normal 450 UART baud rate generation and ADuC7121
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
DL
rate
Baud
×
=
2
16
MHz
78
.
41
(1)
Table 82 lists common baud rate values.
Table 82. Baud Rate Using the Standard Baud Rate Generator
Baud Rate
DL
Actual Baud Rate
% Error
9600
0x88
9600
0%
19,200
0x44
19,200
0%
115,200
0x0B
118,691
3%
Fractional Divider
The fractional divider combined with the normal baud rate
generator allows the generating of a wider range of more
accurate baud rates.
Figure 36. Baud Rate Generation Options
Calculation of the baud rate using fractional divider is as
follows:
)
2048
(
2
16
MHz
78
.
41
N
M
DL
Rate
Baud
+
×
=
(2)
2
16
MHz
78
.
41
2048
×
=
+
DL
Rate
Baud
N
M
For example, generation of 19,200 baud
2
67
16
19200
MHz
78
.
41
2048
×
=
+
N
M
015
.
1
2048
=
+
N
M
where:
M = 1
N = 0.015 × 2048 = 30
(
)
2048
30
1
2
67
16
MHz
78
.
41
+
×
=
Rate
Baud
where Baud Rate = 19,219 bps.
UART REGISTER DEFINITION
The UART interface consists of the following 10 registers:
COMTX: 8-bit transmit register
COMRX: 8-bit receive register
COMDIV0: divisor latch (low byte)
COMDIV1: divisor latch (high byte)
COMCON0: line control register
COMCON1: line control register
COMSTA0: line status register
COMIEN0: interrupt enable register
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.
/16DL
UART
FBEN
CORE
CLOCK
/2
/(M + N/2048)
09492-
035
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