UPSD3433E-40T6 STMicroelectronics, UPSD3433E-40T6 Datasheet - Page 146

• Manufacturer Part Number: UPSD3433E-40T6
• Description: MCU 8BIT 8032 128KB FLASH 52TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3433E-40T6

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IrDA, SPI, UART/USART, USB
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 160KB (160K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-TQFP, 52-VQFP
• For Use With: 497-5518 - EVAL BOARD RFID READER
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-4906

SPI (synchronous peripheral interface)
24.5
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Figure 47. SPI interface, master mode only
SPI configuration
The SPI interface is reset by the MCU reset, and firmware needs to initialize the SFRs
SPICON0, SPICON1, and SPICLKD to define several operation parameters.
The SPO Bit in SPICON0 determines the clock polarity. When SPO is set to '0,' a data bit is
transmitted on SPITxD from one rising edge of SPICLK to the next and is guaranteed to be
valid during the falling edge of SPICLK. When SPO is set to '1,' a data bit is transmitted on
SPITxD from one falling edge of SPICLK to the next and is guaranteed to be valid during the
rising edge of SPICLK. The UPSD34xx will sample received data on the appropriate edge of
SPICLK as determined by SPO. The effect of the SPO Bit can be seen in
Figure 46 on page
The FLSB Bit in SPICON0 determines the bit order while transmitting and receiving the 8-bit
data. When FLSB is '0,' the 8-bit data is transferred in order from MSB (first) to LSB (last).
When FLSB Bit is set to '1,' the data is transferred in order from LSB (first) to MSB (last).
The clock signal generated on SPICLK is derived from the internal PERIPH_CLK signal.
PERIPH_CLK always operates at the frequency, f
stopped in MCU Power Down mode. SPICLK is a result of dividing PERIPH_CLK by a sum
of different divisors selected by the value contained in the SPICLKD register. The default
value in SPICLKD after a reset divides PERIPH_CLK by a factor of 4. The bits in SPICLKD
can be set to provide resulting divisor values in of sums of multiples of 4, such as 4, 8, 12,
PERIPH_CLK
(f OSC )
INTR
8032
to
8
Clock
divide
145.
SPISTAT - Status register
SPICLKD - Divide select
SPICON0, SPICON1
- Control registers
Timing and control
÷128
÷16
÷32
÷64
÷4
÷8
÷1
8
8
generate
Clock
8032 MCU data bus
UPSD3422, UPSD3433, UPSD3434, UPSD3454
OSC
SPITDR - Transmit register
SPIRDR - Receive register
, and runs constantly except when
8-bit SHIFT REGISTER
8
8
8
8
SPISEL / P1.7 or P4.7
SPICLK / P1.4 or P4.4
SPITxD / P1.6 or P4.6
Figure 45
P1.5 or P4.5
SPIRxD /
and
AI10486b