参数资料
型号: ADUC7032BSTZ-8V-RL
厂商: Analog Devices Inc
文件页数: 9/128页
文件大小: 0K
描述: IC BATTERY SENSOR PREC 48-LQFP
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 20.48MHz
连通性: LIN,SPI,UART/USART
外围设备: POR,PSM,温度传感器,WDT
输入/输出数: 9
程序存储器容量: 96KB(48K x 16)
程序存储器类型: 闪存
RAM 容量: 1.5K x 32
电压 - 电源 (Vcc/Vdd): 3.5 V ~ 18 V
数据转换器: A/D 2x16b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 48-LQFP
包装: 标准包装
其它名称: ADUC7032BSTZ-8V-RLDKR
Preliminary Datasheet
ADuC7032
Rev. PrD | Page 106 of 128
UART SERIAL INTERFACE
The ADuC7032 features a 16450 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 or a MODEM, and
parallel-to-serial conversion on data characters received from
the ARM7TDMI. The UART features a fractional divider, which
facilitates high accuracy baud rate generation, and a network
addressable mode. The UART functionality is made available on
GPIO_5, RXD, and GPIO_6, TXD, of the ADuC7032:
The serial communication adopts a asynchronous protocol that
supports various word length, stop bits and parity generation
options selectable in the configuration register.
BAUD RATE GENERATION
The ADuC7032 features two methods of generating the UART
Baud Rate:
1.
Normal 450 UART baud rate generation.
2.
ADuC7032 Fractional Divider
These two methods are explained in detail below.
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).
DL
MHz
Baudrate
CD
×
=
2
16
2
48
.
20
Equation 1 : Standard Baud Rate Generator Formula
Table 69 gives some common baud rate values:
Table 69 : Baud rate using the standard Baud rate generator
Baud
rate
CD
DL
Actual Baud
rate
% error
9600
0
43h
9552
0.50%
19200
0
21h
19394
1.01%
115200
0
6h
106667
7.41%
9600
3
8h
10000
4.17%
19200
3
4h
20000
4.17%
115200
3
1h
80000
30.56%
ADuC7032 Fractional divider:
The fractional divider combined with the normal baud-rate
generator allows the generation of accurate, high speed, baud-
rates.
0
599
4-
0
38
/2
/(M+N/2048)
/16DL
UART
CORE
CLOCK
FBEN
Figure 37 : Fractional Divider Baud Rate generation
Calculation of the baud rate using fractional divider is as follow:
)
2048
(
2
16
2
48
.
20
N
M
DL
MHz
Baudrate
CD
+
×
=
Equation 2 : Fractional Divider Baud Rate Generation Formula
2
16
2
48
.
20
2048
×
=
+
DL
Baudrate
MHz
N
M
CD
Table 70 gives some common baud rate values.
Table 70: Baud rate using the Fractional Baud rate generator
Baud
rate
CD
DL
M
N
Actual
Baud rate
% error
9600
0
42h
1
21
9598.55
0.015%
19200
0
21h
1
21
19197.09
0.015%
115200
0
5h
1
228
115177.51
0.0195%
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