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參數資料
| 型號： | R5F212BCSNFP |
| 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： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁數： | 19/138頁 |
| 文件大?。?/td> | 492K |
| 代理商： | R5F212BCSNFP |
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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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相關代理商/技術參數 |
參數描述 |
|---|---|
| R5F212BCSNFP#U0 | 功能描述:IC R8C/2B MCU FLASH 64-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/2x/2B 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數:21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| R5F212BCSNFP#V2 | 制造商:Renesas Electronics Corporation 功能描述:MCU 2/5V 128K+2KB PB-FREE 64-LQFP - Trays 制造商:Renesas Electronics Corporation 功能描述:MCU 16BIT 128B FLASH 64LQFP |
| R5F212BCSNFP#W4 | 制造商:Renesas Electronics Corporation 功能描述:R8C/2B 128+2/7 2/5V 64LQFP T/R 制造商:Renesas Electronics Corporation 功能描述:R8C/2B 128+2/7 2/5V 64LQFP T/R -20 - +85 - Tape and Reel 制造商:Renesas 功能描述:R8C/2B 128+2/7 2/5V 64LQFP T/R |
| R5F212BCSNFP#X6 | 制造商:Renesas Electronics Corporation 功能描述:MCU 2/5V 128K+2KB PB-FREE 64-LQFP T/R - Tape and Reel 制造商:Renesas Electronics Corporation 功能描述:MCU 16BIT 128B FLASH 64LQFP |
| R5F212BCSNLG | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS MCU |
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