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参数资料
| 型号： | ADE5166ASTZF62-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 135/156页 |
| 文件大小： | 0K |
| 描述： | IC METER/8052/RTC/LCD DRV 64LQFP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,500 |
| 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： | 带卷 (TR) |
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f CORE
SBAUDF = 64 × ?
? 1 ?
? 16 × 2 DIV + SBTH × Baud Rate
?
?
Rx
Data Sheet
SBAUDF is the fractional divider ratio required to achieve the
required baud rate. The appropriate value for SBAUDF can be
calculated with the following formula:
? ?
?
Note that SBAUDF should be rounded to the nearest integer.
After the values for DIV and SBAUDF are calculated, the actual
baud rate can be calculated with the following formula:
ADE5166/ADE5169/ADE5566/ADE5569
enhanced error checking functionality is available through the
frame error bit, FE, in the enhanced serial baud rate control SFR
(SBAUDT, Address 0x9E[6]). The FE bit is set on framing errors
for both 8-bit and 9-bit UARTs.
START
D0 D1 D2 D3 D4 D5 D6 D7 STOP
RI
FE
EXTEN = 1
f CORE
SBAUDF ?
× ? ? 1 +
16 × 2
?
Acutal Baud Rate =
DIV + SBTH
? 64 ?
For example, to obtain a baud rate of 9600 bps while operating
Rx
START
Figure 109. UART Timing in Mode 1
D0 D1 D2 D3 D4 D5 D6
D7
D8
STOP
at a core clock frequency of 4.096 MHz and with the PLL CD
log ? ?
4,096,000 ?
? 16 × 9600 ? = 4.74 = 4
log ( 2 )
SBAUDF = 64 × ? ? 4 , 096 , 000 ? 1 ? ? = 42.67 = 0x2B
? 16 × 2 × 9600 ?
bits equal to 0
?
DIV + SBTH =
Note that the DIV result is rounded down.
4
Thus, the actual baud rate is 9570 bps, resulting in a 0.31% error.
UART ADDITIONAL FEATURES
Enhanced Error Checking
The extended UART provides frame error, break error, and over-
write error detection. Framing errors occur when a stop bit is
not present at the end of the frame. A missing stop bit implies
that the data in the frame may not have been received properly.
Break error detection indicates whether the RxD line has been low
for longer than a 9-bit frame. It indicates that the data just received,
a 0 or null character, is not valid because the master has discon-
nected. Overwrite error detection indicates when the received data
has not been read fast enough and, as a result, a byte of data has
been lost.
The 8052 standard UART offers frame error checking for an 8-bit
UART through SM2 (Bit 5) and RB8 (Bit 2) in the serial commu-
nications control SFR (SCON, Address 0x98). Setting the SM2 bit
prevents frames without a stop bit from being received. The stop
bit is latched into the RB8 bit. This bit can be examined to
determine if a valid frame was received. The 8052 does not,
however, provide frame error checking for a 9-bit UART. This
RI
FE
EXTEN = 1
Figure 110. UART Timing in Mode 2 and Mode 3
The 8052 standard UART does not provide break error detection.
However, for an 8-bit UART, a break error can be detected when
the received character is 0, a null character, and when there is a
no stop bit because the RB8 bit is low. Break error detection is
not possible for a 9-bit 8052 UART because the stop bit is not
recorded. The ADE5166/ADE5169/ADE5566/ADE5569
enhanced break error detection is available through the BE bit
(SBAUDT[5]).
The 8052 standard UART prevents overwrite errors by not allowing
a character to be received when RI, the receive interrupt flag
(SCON[0]), is set. However, it does not indicate if a character
has been lost because the RI bit is set when the frame is received.
The enhanced UART overwrite error detection provides this infor-
mation. When the enhanced 8052 UART is enabled, a frame is
received regardless of the state of the RI flag. If RI = 1 when a
new byte is received, the byte in SCON is overwritten, and the
overwrite error flag, OWE2 in the Serial Communications
Control 2 SFR (SCON2, Address 0xE1[5]), is set. The overwrite
error flag is cleared when SBUF is read.
The extended UART is enabled by setting the EXTEN bit in the
configuration SFR (CFG, Address 0xAF[6]).
UART TxD Signal Modulation
There is an internal 38 kHz signal that can be OR’ed with the
UART transmit signal for use in remote control applications
(see the 38 kHz Modulation section).
Rev. D | Page 135 of 156
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