ST7LITE25F2 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST7LITE25F2
STMicroelectronics
'ST7LITE25F2' PDF : 170 Pages View PDF
ST7LITE20F2 ST7LITE25F2 ST7LITE29F2
On-chip peripherals
Data I/O register (SPIDR)
Read/Write
Reset Value: Undefined
7
0
D7
D6
D5
D4
D3
D2
D1
D0
Note:
Caution:
The SPIDR register is used to transmit and receive data on the serial bus. In a master
device, a write to this register will initiate transmission/reception of another byte.
During the last clock cycle the SPIF bit is set, a copy of the received data byte in the shift
register is moved to a buffer. When the user reads the serial peripheral data I/O register, the
buffer is actually being read.
While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR
register is read.
A write to the SPIDR register places data directly into the shift register for transmission.
A read to the SPIDR register returns the value located in the buffer and not the content of
the shift register (see Figure 42: Serial peripheral interface block diagram).
Table 43. SPI register map and reset values
Address Register
(Hex.)
label
7
6
5
4
0031h
0032h
0033h
SPIDR
Reset value
SPICR
Reset value
SPICSR
Reset value
MSB
x
SPIE
0
SPIF
0
x
SPE
0
WCOL
0
x
SPR2
0
OVR
0
x
MSTR
0
MODF
0
3
x
CPOL
x
0
2
x
CPHA
x
SOD
0
1
x
SPR1
x
SSM
0
0
LSB
x
SPR0
x
SSI
0
11.5
11.5.1
10-bit A/D converter (ADC)
Introduction
The analog to digital converter (ADC) peripheral is a 10-bit, successive approximation
converter with internal sample and hold circuitry. This peripheral has up to 7 multiplexed
analog input channels (refer to Table 2: Device pin description) that allow the peripheral to
convert the analog voltage levels from up to 7 different sources.
The result of the conversion is stored in a 10-bit Data Register. The A/D converter is
controlled through a Control/Status Register.
Doc ID 8349 Rev 5
103/166
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