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參數(shù)資料
| 型號(hào)： | MR80C32-36:RD |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 36 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 117/120頁(yè) |
| 文件大小： | 25028K |
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203
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
20.4
SPI Data Modes and Timing
There are four combinations of XCKn (SCK) phase and polarity with respect to serial data, which
are determined by control bits UCPHAn and UCPOLn. The data transfer timing diagrams are
shown in Figure 20-1. Data bits are shifted out and latched in on opposite edges of the XCKn
signal, ensuring sufficient time for data signals to stabilize. The UCPOLn and UCPHAn function-
ality is summarized in Table 20-2. Note that changing the setting of any of these bits will corrupt
all ongoing communication for both the Receiver and Transmitter.
Figure 20-1. UCPHAn and UCPOLn data transfer timing diagrams.
20.5
Frame Formats
A serial frame for the MSPIM is defined to be one character of eight data bits. The USART in
MSPIM mode has two valid frame formats:
8-bit data with MSB first
8-bit data with LSB first
A frame starts with the least or most significant data bit. Then the next data bits, up to a total of
eight, are succeeding, ending with the most or least significant bit accordingly. When a complete
frame is transmitted, a new frame can directly follow it, or the communication line can be set to
an idle (high) state.
The UDORDn bit in UCSRnC sets the frame format used by the USART in MSPIM mode. The
Receiver and Transmitter use the same setting. Note that changing the setting of any of these
bits will corrupt all ongoing communication for both the Receiver and Transmitter.
16-bit data transfer can be achieved by writing two data bytes to UDRn. A UART transmit com-
plete interrupt will then signal that the 16-bit value has been shifted out.
Table 20-2.
UCPOLn and UCPHAn functionality.
UCPOLn
UCPHAn
SPI mode
Leading edge
Trailing edge
0
Sample (Rising)
Setup (Falling)
0
1
Setup (Rising)
Sample (Falling)
1
0
2
Sample (Falling)
Setup (Rising)
1
3
Setup (Falling)
Sample (Rising)
XCK
Data setup (TXD)
Data sample (RXD)
XCK
Data setup (TXD)
Data sample (RXD)
XCK
Data setup (TXD)
Data sample (RXD)
XCK
Data setup (TXD)
Data sample (RXD)
UCPOL=0
UCPOL=1
UCPHA=0
UCPHA=1
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