參數(shù)資料
型號： ADUC7023BCP6Z62IRL
廠商： Analog Devices Inc
文件頁數(shù)： 50/96頁
文件大小： 0K
描述： IC MCU 12BIT 62KB FLASH 40LFCSP
標準包裝： 2,500
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 44MHz
連通性： I²C，SPI
外圍設備： POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲器容量： 64KB（32K x 16）
程序存儲器類型： 閃存
RAM 容量： 2K x 32
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 12 x12b; D/A 4x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 40-VFQFN 裸露焊盤，CSP
包裝： 帶卷 (TR)
ADuC7023
Data Sheet
| Page 54 of 96
Table 62. GPxCLR MMR Bit Descriptions
Bit
Description
31 to 24
Reserved.
23 to 16
Data port x clear bit.
This bit is set to 1 by the user to clear the bit on Port x;
this bit also clears the corresponding bit in the GPxDAT
MMR.
This bit is cleared to 0 by the user; this bit does not affect
the data out.
15 to 0
Reserved.
SERIAL PERIPHERAL INTERFACE
The ADuC7023 integrates a complete hardware serial peripheral
interface (SPI) on chip. SPI is an industry standard, synchronous
serial interface that allows eight bits of data to be synchronously
transmitted and simultaneously received, that is, full duplex up
to a maximum bit rate of 20 Mbps.
The SPI port can be configured for master or slave operation and
typically consists of four pins: MISO, MOSI, SCLK, and SPISS.
MISO (Master In, Slave Out) Pin
The MISO pin is configured as an input line in master mode
and an output line in slave mode. The MISO line on the master
(data in) should be connected to the MISO line in the slave
device (data out). The data is transferred as byte wide (8-bit)
serial data, MSB first.
MOSI (Master Out, Slave In) Pin
The MOSI pin is configured as an output line in master mode
and an input line in slave mode. The MOSI line on the master
(data out) should be connected to the MOSI line in the slave
device (data in). The data is transferred as byte wide (8-bit)
serial data, MSB first.
SCLK (Serial Clock I/O) Pin
The master serial clock (SCLK) synchronizes the data being
transmitted and received through the MOSI SCLK period.
Therefore, a byte is transmitted/received after eight SCLK
periods. The SCLK pin is configured as an output in master
mode and as an input in slave mode.
In master mode, polarity and phase of the clock are controlled
by the SPICON register, and the bit rate is defined in the
SPIDIV register as follows:
)
1
(
2
SPIDIV
f
UCLK
CLOCK
SERIAL
+
×
=
where:
fUCLK is the clock selected by POWCON1 Bit 7 to Bit 6.
The maximum speed of the SPI clock is independent on the
clock divider bits.
In slave mode, the SPICON register must be configured with
the phase and polarity of the expected input clock. The slave
accepts data from an external master up to 10 Mbps.
In both master and slave modes, data is transmitted on one edge
of the SCLK signal and sampled on the other. Therefore, it is
important that the polarity and phase are configured the same
for the master and slave devices.
SPI Chip Select (SS Input) Pin
In SPI slave mode, a transfer is initiated by the assertion of SS,
which is an active low input signal. The SPI port then transmits
and receives 8-bit data until the transfer is concluded by
deassertion of SS. In slave mode, SS is always an input.
In SPI master mode, the SS is an active low output signal. It
asserts itself automatically at the beginning of a transfer and
deasserts itself upon completion.
Configuring External Pins for SPI Functionality
P1.1 is the slave chip select pin. In slave mode, this pin is an
input and must be driven low by the master. In master mode,
this pin is an output and goes low at the beginning of a transfer
and high at the end of a transfer.
P1.0 is the SCLK pin.
P0.6 is the master in, slave out (MISO) pin.
P0.7 is the master out, slave in (MOSI) pin.
To configure these pins for SPI mode, see the General-Purpose
SPI Registers
The following MMR registers control the SPI interface: SPISTA,
SPIRX, SPITX, SPIDIV, and SPICON.
SPI Status Register
Name:
SPISTA
Address:
0xFFFF0A00
Default value: 0x0000
Access:
Read
Function:
This 32-bit MMR contains the status of the SPI
interface in both master and slave modes.
Rev. E
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