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参数资料
| 型号： | ADUC836BSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 40/80页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 16BIT W/MCU 52-MQFP |
| 产品培训模块： | Process Control |
| 标准包装： | 1 |
| 系列： | MicroConverter® ADuC8xx |
| 核心处理器： | 8052 |
| 芯体尺寸： | 8-位 |
| 速度： | 12.58MHz |
| 连通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外围设备： | POR，PSM，PWM，温度传感器，WDT |
| 输入/输出数： | 34 |
| 程序存储器容量： | 62KB（62K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.25 V |
| 数据转换器： | A/D 7x16b; D/A 1x12b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 52-QFP |
| 包装： | 托盘 |
| 产品目录页面： | 738 (CN2011-ZH PDF) |
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ADuC836
–44–
ADuC836
–45–
SPIDAT
SPI Data Register
Function
The SPIDAT SFR is written by the user to transmit data over the SPI interface or read by user code to read
data just received by the SPI interface.
SFR Address
F7H
Power-On Default Value
00H
Bit Addressable
No
Depending on the configuration of the bits in the SPICON SFR
shown in Table XXI, the ADuC836 SPI interface will transmit
or receive data in a number of possible modes. Figure 34 shows
all possible ADuC836 SPI configurations and the timing rela-
tionships and synchronization between the signals involved. Also
shown in this figure is the SPI Interrupt bit (ISPI) and how it is
triggered at the end of each byte-wide communication.
SCLOCK
(CPOL = 1)
SCLOCK
(CPOL = 0)
(CPHA = 1)
(CPHA = 0)
SAMPLE INPUT
ISPI FLAG
DATA OUTPUT
ISPI FLAG
SAMPLE INPUT
DATA OUTPUT
?
MSB BIT 6 BIT 5
?
BIT 4 BIT 3 BIT 2 BIT 1 LSB
MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
SS
Figure 34. SPITiming, All Modes
SPI Interface—Master Mode
In Master mode, the SCLOCK pin is always an output and gen-
erates a burst of eight clocks whenever user code writes to the
SPIDAT Register.The SCLOCK bit rate is determined by SPR0
and SPR1 in SPICON. It should also be noted that the SS pin
is not used in Master mode. If the ADuC836 needs to assert
the SS pin on an external slave device, a port digital output pin
should be used.
In Master mode, a byte transmission or reception is initiated
by a write to SPIDAT. Eight clock periods are generated via
the SCLOCK pin and the SPIDAT byte being transmitted via
MOSI.With each SCLOCK period, a data bit is also sampled
via MISO. After eight clocks, the transmitted byte will have been
completely transmitted and the input byte will be waiting in the
input shift register.The ISPI flag will be set automatically and an
interrupt will occur if enabled.The value in the shift register will
be latched into SPIDAT.
SPI Interface—Slave Mode
In Slave mode, the SCLOCK is an input.The SS pin must also
be driven low externally during the byte communication.Trans-
mission is also initiated by a write to SPIDAT. In Slave mode,
a data bit is transmitted via MISO and a data bit is received via
MOSI through each input SCLOCK period. After eight clocks,
the transmitted byte will have been completely transmitted and
the input byte will be waiting in the input shift register.The ISPI
flag will be set automatically and an interrupt will occur if enabled.
The value in the shift register will be latched into SPIDAT only
when the transmission/reception of a byte has been completed.
The end of transmission occurs after the eighth clock has been
received, if CPHA = 1 or when SS returns high if CPHA = 0.
REV. A
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