参数资料
型号: ADE5569ASTZF62
厂商: Analog Devices Inc
文件页数: 134/156页
文件大小: 0K
描述: IC METER/8052/RTC/LCD DRV 64LQFP
标准包装: 1
输入阻抗: *
测量误差: *
电压 - 高输入/输出: *
电压 - 低输入/输出: *
电流 - 电源: *
电源电压: *
测量仪表类型: *
工作温度: *
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 托盘
ADE5166/ADE5169/ADE5566/ADE5569
Data Sheet
Because Timer 2 has 16-bit autoreload capability, very low baud
rates are still possible. Timer 2 is selected as the baud rate generator
f CORE
TIMER 1/TIMER 2
by setting RCLK and/or TCLK in the Timer/Counter 2 control
SFR (T2CON, Address 0xC8[5:4]). The baud rates for transmit
and receive can be simultaneously different. Setting RCLK and/or
FRACTIONAL
DIVIDER
÷(1 + SBAUDF/64)
Tx CLOCK
TIMER 1/TIMER 2
Rx CLOCK
1
0
TCLK puts Timer 2 into its baud rate generator mode, as shown in
Figure 108.
÷2 DIV + SBTH
Rx CLOCK
In this case, the baud rate is given by the following formula:
Mode 1 or Mode 3 Baud Rate =
÷32
1
UART TIMER
Rx/Tx CLOCK
0
UARTBAUDEN
Tx CLOCK
f CORE
log ?
?
log ( 2 )
f CORE
( 16 × [ 65536 ? ( RCAP 2 H : RCAP 2 L ) ] )
UART Timer Generated Baud Rates
The high integer dividers in a UART block mean that high speed
baud rates are not always possible. In addition, generating baud
rates requires the exclusive use of a timer, rendering it unusable
for other applications when the UART is required. To address
this problem, each ADE5166/ADE5169/ADE5566/ADE5569
has a dedicated baud rate timer (UART timer) specifically for
generating highly accurate baud rates. The UART timer can be
used instead of Timer 1 or Timer 2 for generating very accurate
high speed UART baud rates, including 115,200 bps. This timer
also allows a much wider range of baud rates to be obtained. In
fact, every desired bit rate from 12 bps to 393,216 bps can be
generated to within an error of ±0.8%. The UART timer also
Figure 107. UART Timer, UART Baud Rate
Two SFRs, the enhanced serial baud rate control SFR (SBAUDT,
Address 0x9E) and UART timer fractional divider SFR (SBAUDF,
Address 0x9D), are used to control the UART timer. SBAUDT
is the baud rate control SFR; it sets up the integer divider (the DIV
bits, Bits[2:0]) and the extended divider (the SBTH bits, Bits[4:3])
for the UART timer.
The appropriate value to write to the DIV bits and the SBTH
bits can be calculated using the following formula, where f CORE is
defined in the POWCON SFR (see Table 26). Note that the DIV
value must be rounded down to the nearest integer.
? ?
? ?
? 16 × Baud Rate ?
DIV + SBTH =
frees up the other three timers, allowing them to be used for
different applications. A block diagram of the UART timer is
shown in Figure 107.
TIMER 1
OVERFLOW
2
0
1
f CORE
C/ T2 = 0
CONTROL
TIMER 2
SMOD
TL2
(8 BITS)
TH2
(8 BITS)
OVERFLOW
1
0
RCLK
T2 PIN
(P1.4/T2/FP23)
C/ T2 = 1
1
0
16
Rx
CLOCK
TR2
TCLK
NOTE: AVAILABILITY OF ADDITIONAL
EXTERNAL INTERRUPT
RCAP2L
RCAP2H
RELOAD
16
Tx
CLOCK
T2EX PIN
(P1.3/T2EX/FP24)
TRANSITION
CONTROL
EXF 2
TIMER 2
INTERRUPT
P1.4/T2/FP23
DETECTOR
EXEN2
Figure 108. Timer 2, UART Baud Rates
Rev. D | Page 134 of 156
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