S9S12GN32F0MFT Freescale Semiconductor, S9S12GN32F0MFT Datasheet - Page 718
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S9S12GN32F0MFT
Manufacturer Part Number
S9S12GN32F0MFT
Description
16-bit Microcontrollers - MCU 16-bit32k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12GN16F0CFT.pdf
(1292 pages)
Specifications of S9S12GN32F0MFT
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
32 KB
Data Ram Size
2048 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
TSSOP-20
Mounting Style
SMD/SMT
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Serial Peripheral Interface (S12SPIV5)
As long as no more than one slave device drives the system slave’s serial data output line, it is possible for
several slaves to receive the same transmission from a master, although the master would not receive return
information from all of the receiving slaves.
If the CPHA bit in SPI control register 1 is clear, odd numbered edges on the SCK input cause the data at
the serial data input pin to be latched. Even numbered edges cause the value previously latched from the
serial data input pin to shift into the LSB or MSB of the SPI shift register, depending on the LSBFE bit.
If the CPHA bit is set, even numbered edges on the SCK input cause the data at the serial data input pin to
be latched. Odd numbered edges cause the value previously latched from the serial data input pin to shift
into the LSB or MSB of the SPI shift register, depending on the LSBFE bit.
When CPHA is set, the first edge is used to get the first data bit onto the serial data output pin. When CPHA
is clear and the SS input is low (slave selected), the first bit of the SPI data is driven out of the serial data
output pin. After the nth
the SPI data register. To indicate transfer is complete, the SPIF flag in the SPI status register is set.
21.4.3
During an SPI transmission, data is transmitted (shifted out serially) and received (shifted in serially)
simultaneously. The serial clock (SCK) synchronizes shifting and sampling of the information on the two
serial data lines. A slave select line allows selection of an individual slave SPI device; slave devices that
are not selected do not interfere with SPI bus activities. Optionally, on a master SPI device, the slave select
line can be used to indicate multiple-master bus contention.
1. n depends on the selected transfer width, please refer to
720
Transmission Formats
When peripherals with duplex capability are used, take care not to
simultaneously enable two receivers whose serial outputs drive the same
system slave’s serial data output line.
A change of the bits CPOL, CPHA, SSOE, LSBFE, MODFEN, SPC0, or
BIDIROE with SPC0 set in slave mode will corrupt a transmission in
progress and must be avoided.
SHIFT REGISTER
GENERATOR
BAUD RATE
MASTER SPI
1
shift, the transfer is considered complete and the received data is transferred into
Figure 21-11. Master/Slave Transfer Block Diagram
MC9S12G Family Reference Manual,
MISO
MOSI
SCK
SS
NOTE
NOTE
Section 21.3.2.2, “SPI Control Register 2 (SPICR2)
V
DD
MISO
MOSI
SCK
SS
Rev.1.23
SHIFT REGISTER
SLAVE SPI
Freescale Semiconductor
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