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型號(hào)：	UPD70F3306GC-8BT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP80
封裝：	14 X 14 MM, PLASTIC, TQFP-80
文件頁(yè)數(shù)：	667/755頁(yè)
文件大小：	4717K
代理商：	UPD70F3306GC-8BT

SAM G51 [DATASHEET]

11209C–ATARM–20-Dec-13

transmitter as desired. Enabling both the receiver and the transmitter at the same time in ISO7816 mode may lead to

unpredictable results.

The ISO7816 specification defines an inverse transmission format. Data bits of the character must be transmitted on the

I/O line at their negative value.

30.7.4.2

Protocol T = 0

In T = 0 protocol, a character is made up of one start bit, eight data bits, one parity bit and one guard time, which lasts

two bit times. The transmitter shifts out the bits and does not drive the I/O line during the guard time.

If no parity error is detected, the I/O line remains to 1 during the guard time and the transmitter can continue with the

transmission of the next character, as shown in Figure 30-21.

If a parity error is detected by the receiver, it drives the I/O line to 0 during the guard time, as shown in Figure 30-22. This

error bit is also named NACK, for Non Acknowledge. In this case, the character lasts 1 bit time more, as the guard time

length is the same and is added to the error bit time which lasts 1 bit time.

When the USART is the receiver and it detects an error, it does not load the erroneous character in the Receive Holding

Figure 30-21. T = 0 Protocol without Parity Error

Figure 30-22. T = 0 Protocol with Parity Error

Receive Error Counter

The USART receiver also records the total number of errors. This can be read in the Number of Error (US_NER) register.

The NB_ERRORS field can record up to 255 errors. Reading US_NER automatically clears the NB_ERRORS field.

Receive NACK Inhibit

The USART can also be configured to inhibit an error. This can be achieved by setting the INACK bit in US_MR. If INACK

is to 1, no error signal is driven on the I/O line even if a parity bit is detected.

Moreover, if INACK is set, the erroneous received character is stored in the Receive Holding register, as if no error

occurred and the RXRDY bit does rise.

Transmit Character Repetition

When the USART is transmitting a character and gets a NACK, it can automatically repeat the character before moving

on to the next one. Repetition is enabled by writing the MAX_ITERATION field in the US_MR at a value higher than 0.

Each character can be transmitted up to eight times; the first transmission plus seven repetitions.

If MAX_ITERATION does not equal zero, the USART repeats the character as many times as the value loaded in

MAX_ITERATION.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
UPD70F3306GK-9EU-A	制造商:Renesas Electronics 功能描述:V850ES 20MHz 制造商:Renesas Electronics 功能描述:V850ES 20MHz Cut Tape
UPD70F3306YGK-9EU-A	制造商:Renesas Electronics Corporation 功能描述:
UPD70F3308GK-9EU-A	制造商:Renesas Electronics Corporation 功能描述:
UPD70F3313GC-8EU-A	制造商:Renesas Electronics Corporation 功能描述:
UPD70F3313YGC-8EA-A	制造商:Renesas Electronics Corporation 功能描述:

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