参数资料
型号: PIC16C71T-04/SO
厂商: Microchip Technology
文件页数: 84/177页
文件大小: 0K
描述: IC MCU OTP 1KX14 A/D 18SOIC
产品培训模块: Asynchronous Stimulus
标准包装: 1,100
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 13
程序存储器容量: 1.75KB(1K x 14)
程序存储器类型: OTP
RAM 容量: 36 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 6 V
数据转换器: A/D 4x8b
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 18-SOIC(0.295",7.50mm 宽)
包装: 带卷 (TR)
174
7593L–AVR–09/12
AT90USB64/128
Bit 3 – CPOL: Clock Polarity
When this bit is written to one, SCK is high when idle. When CPOL is written to zero, SCK is low
when idle. Refer to Figure 18-3 and Figure 18-4 for an example. The CPOL functionality is sum-
marized in Table 18-2:
Bit 2 – CPHA: Clock Phase
The settings of the Clock Phase bit (CPHA) determine if data is sampled on the leading (first) or
trailing (last) edge of SCK. Refer to Figure 18-3 and Figure 18-4 for an example. The CPOL
functionality is summarized Table 18-3:
Bits 1, 0 – SPR1, SPR0: SPI Clock Rate Select 1 and 0
These two bits control the SCK rate of the device configured as a Master. SPR1 and SPR0 have
no effect on the Slave. The relationship between SCK and the Oscillator Clock frequency f
osc is
shown in Table 18-4:
18.1.4
SPSR – SPI Status Register
Bit 7 – SPIF: SPI Interrupt Flag
When a serial transfer is complete, the SPIF Flag is set. An interrupt is generated if SPIE in
SPCR is set and global interrupts are enabled. If SS is an input and is driven low when the SPI is
in Master mode, this will also set the SPIF Flag. SPIF is cleared by hardware when executing the
Table 18-2.
CPOL functionality.
CPOL
Leading edge
Trailing edge
0
Rising
Falling
1
Falling
Rising
Table 18-3.
CPHA functionality.
CPHA
Leading edge
Trailing edge
0
Sample
Setup
1
Setup
Sample
Table 18-4.
Relationship between SCK and the oscillator frequency.
SPI2X
SPR1
SPR0
SCK frequency
00
0
f
osc/4
00
1
f
osc/16
01
0
f
osc/64
01
1
f
osc/128
10
0
f
osc/2
10
1
f
osc/8
11
0
f
osc/32
11
1
f
osc/64
Bit
7
65
43
21
0
SPIF
WCOL
SPI2X
SPSR
Read/write
RR
RR/W
Initial value
00
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