參數(shù)資料
型號: ADUC7126BSTZ126-RL
廠商: Analog Devices Inc
文件頁數(shù): 67/108頁
文件大?。?/td> 0K
描述: IC MCU 16/32B 126KB FLASH 80LQFP
標(biāo)準(zhǔn)包裝: 1,000
系列: MicroConverter® ADuC7xxx
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 41.78MHz
連通性: EBI/EMI,I²C,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 40
程序存儲器容量: 126KB(63K x 16)
程序存儲器類型: 閃存
RAM 容量: 32K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x12b,D/A 4x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 80-LQFP
包裝: 帶卷 (TR)
Data Sheet
ADuC7124/ADuC7126
Rev. C | Page 61 of 108
Baud Rate Generation
There are two ways of generating the UART baud rate, using
normal 450 UART baud rate generation and using the fractional
divider.
Normal 450 UART Baud Rate Generation
The baud rate is a divided version of the core clock using the value
in the COMxDIV0 and COMxDIV1 MMRs (16-bit value, DL).
DL
Rate
Baud
CD
×
=
2
16
2
MHz
78
.
41
Table 91 gives some common baud rate values.
Table 91. 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
The Fractional Divider
The fractional divider, combined with the normal baud rate
generator, produces a wider range of more accurate baud rates.
09
12
3-
03
2
÷ 16DL
UART
FBEN
CORE
CLOCK
÷ 2
÷ (M + N ÷ 2048)
Figure 48. 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
16
2
MHz
78
.
41
2048
×
=
+
DL
Rate
Baud
N
M
CD
For example, generation of 19,200 baud with CD bits = 3
(Table 91 gives DL = 0x08) is
2
8
16
2
200
,
19
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
3
Rate
Baud
where:
Baud Rate = 19,200 bps.
Error is 0%, compared to 6.25% with the normal baud rate
generator.
UART Register Definitions
COM0TX Register
Name:
COM0TX
Address:
0xFFFF0700
Default Value:
0x00
Access:
Read/write
COM0TX is an 8-bit transmit register for UART0.
COM1TX Register
Name:
COM1TX
Address:
0xFFFF0740
Default Value:
0x00
Access:
Read/write
COM1TX is an 8-bit transmit register for UART1.
COM0RX Register
Name:
COM0RX
Address:
0xFFFF0700
Default Value:
0x00
Access:
Read only
COM0RX is an 8-bit receive register for UART0.
COM1RX Register
Name:
COM1RX
Address:
0xFFFF0740
Default Value:
0x00
Access:
Read only
COM1RX is an 8-bit receive register for UART1.
COM0DIV0 Register
Name:
COM0DIV0
Address:
0xFFFF0700
Default Value:
0x00
Access:
Read/write
COM0DIV0 is a low byte divisor latch for UART0. COM0TX,
COM0RX, and COM0DIV0 share the same address location.
COM0TX and COM0RX can be accessed when Bit 7 in the
COM0CON0 register is cleared. COM0DIV0 can be accessed
when Bit 7 of COM0CON0 is set.
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