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參數(shù)資料
| 型號： | MC33591 |
| 廠商： | Motorola, Inc. |
| 英文描述： | PLL Tuned UHF Receiver for Data Transfer Applications |
| 中文描述： | 鎖相環(huán)調(diào)諧UHF接收器的數(shù)據(jù)傳輸應用 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 699K |
| 代理商： | MC33591 |
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CONFIGURATION REGISTERS
10
MC33591 Technical Data
MOTOROLA
bits may lead to unexpected configurations. The first bit transmitted on MOSI does not change the content of the
configuration registers. Note that a low level applied on RESETB does not affect the configuration register
content.
When RESETB is set to a high level, if Data Manager is enabled (DME=1), ROMEO2 becomes master and
sends received data on the MOSI line and the recovered clock on SCLK. It is then recommended that the MCU
SPI is set as slave. If the data received does not fit in an entire number of bytes, the data manager will fill the last
byte. If the data received constitute an whole number of bytes, the data manager may generate and send an
extra byte whose content is irrelevant. If DME=0, the SPI is disabled. Raw data is sent on the MOSI line.
When ROMEO2 SPI is changed from master (run mode) to slave (configuration mode) or from slave to
master, it is recommended that the MCU SPI is set as slave before the mode transition.
At power-on, the POR resets the internal registers. This defines the receiver default configuration (see gray
rows on tables 4, 7 & 8). In this configuration, the SPI is disabled and ROMEO2 sends raw data on the MOSI line.
This default configuration enables the circuit to operate as a standalone receiver without any external control.
After POR, RESETB forces a low level. Therefore an external pull-up resistor should be used in order to avoid
entering configuration mode.
Figure 12: Writing into configuration registers
Figure 13: Reading configuration registers
CONFIGURATION REGISTERS
Table 4 describes the
Configuration Register 1
(CR1).
Table 4: Configuration Register 1
bit 7
bit 6
bit 5
R/W
CF
MOD
1
1
0
bit 4
SOE
1
bit 3
SR1
0
bit 2
SR0
1
bit 1
DME
0
bit 0
HE
0
Bit name
Reset value
MOSI line
CR1
CR2
CR3
0
SCLK line
MCU (master)
ROMEO2
MOSI line
Don’t care
Don’t care
Don’t care
1
SCLK line
MCU (master)
ROMEO2
MCU (master)
ROMEO2
MISO line
CR2
CR3
CR1
1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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