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參數(shù)資料
| 型號： | R5F212ACSNFA |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 19/138頁 |
| 文件大?。?/td> | 492K |
| 代理商： | R5F212ACSNFA |
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202
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
The recommendations of the maximum receiver baud rate error was made under the assump-
tion that the Receiver and Transmitter equally divides the maximum total error.
There are two possible sources for the receivers baud rate error. The Receiver’s system clock
(XTAL) will always have some minor instability over the supply voltage range and the tempera-
ture range. When using a crystal to generate the system clock, this is rarely a problem, but for a
resonator the system clock may differ more than 2% depending of the resonators tolerance. The
second source for the error is more controllable. The baud rate generator can not always do an
exact division of the system frequency to get the baud rate wanted. In this case an UBRR value
that gives an acceptable low error can be used if possible.
18.9
Multi-processor Communication Mode
This mode is available only in USART mode, not in EUSART.
Setting the Multi-processor Communication mode (MPCM) bit in UCSRA enables a filtering
function of incoming frames received by the USART Receiver. Frames that do not contain
address information will be ignored and not put into the receive buffer. This effectively reduces
the number of incoming frames that has to be handled by the CPU, in a system with multiple
MCUs that communicate via the same serial bus. The Transmitter is unaffected by the MPCM
setting, but has to be used differently when it is a part of a system utilizing the Multi-processor
Communication mode.
18.9.1
MPCM Protocol
If the Receiver is set up to receive frames that contain 5 to 8 data bits, then the first stop bit indi-
cates if the frame contains data or address information. If the Receiver is set up for frames with
nine data bits, then the ninth bit (RXB8) is used for identifying address and data frames. When
the frame type bit (the first stop or the ninth bit) is one, the frame contains an address. When the
frame type bit is zero the frame is a data frame.
The Multi-processor Communication mode enables several slave MCUs to receive data from a
master MCU. This is done by first decoding an address frame to find out which MCU has been
addressed. If a particular slave MCU has been addressed, it will receive the following data
frames as normal, while the other slave MCUs will ignore the received frames until another
address frame is received.
18.9.2
Using MPCM
For an MCU to act as a master MCU, it can use a 9-bit character frame format (UCSZ = 7). The
ninth bit (TXB8) must be set when an address frame (TXB8 = 1) or cleared when a data frame
Table 18-3.
Recommended Maximum Receiver Baud Rate Error for Double Speed Mode
(U2X = 1)
D
# (Data+Parity Bit)
R
slow (%)
R
fast (%)
Max Total Error (%)
Recommended Max
Receiver Error (%)
5
94.12
105.66
+5.66/-5.88
± 2.5
6
94.92
104.92
+4.92/-5.08
± 2.0
7
95.52
104,35
+4.35/-4.48
± 1.5
8
96.00
103.90
+3.90/-4.00
± 1.5
9
96.39
103.53
+3.53/-3.61
± 1.5
10
96.70
103.23
+3.23/-3.30
± 1.0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R5F212ACSNFA#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 16-bit R8C CISC 128KB Flash 2.5V/3.3V/5V 64-Pin LQFP 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 128KB FLASH 64LQFP |
| R5F212ACSNFA#V0 | 功能描述:MCU FLASH 128KB 64-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/2x/2A 標(biāo)準(zhǔn)包裝:96 系列:PIC® 16F 核心處理器:PIC 芯體尺寸:8-位 速度:20MHz 連通性:I²C，SPI 外圍設(shè)備:欠壓檢測/復(fù)位，POR，PWM，WDT 輸入/輸出數(shù):11 程序存儲器容量:3.5KB（2K x 14） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:128 x 8 電壓 - 電源 (Vcc/Vdd):2.3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 包裝:管件 |
| R5F212ACSNFA#V2 | 制造商:Renesas Electronics Corporation 功能描述:R8C/2A 128K/7.5K 64LQFP 14X14 - Trays 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 128KB FLASH |
| R5F212ACSNFP | 制造商:Renesas Electronics Corporation 功能描述:Microcontroller,R8C/2A,ROM128K |
| R5F212ACSNFP#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 16-Bit R8C CISC 128KB Flash 2.5V/3.3V/5V 64-Pin LQFP 制造商:Renesas Electronics Corporation 功能描述:MCU 16BIT R8C CISC 128KB FLASH 2.5V/3.3V/5V 64LQFP - Trays 制造商:Renesas Electronics 功能描述:R8C 20MHz 制造商:Renesas 功能描述:MCU 16-Bit R8C CISC 128KB Flash 2.5V/3.3V/5V 64-Pin LQFP |
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