UPSD3433E-40U6 STMicroelectronics, UPSD3433E-40U6 Datasheet - Page 83

• Manufacturer Part Number: UPSD3433E-40U6
• Description: MCU 8BIT 8032 128KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3433E-40U6

• 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: 46
• 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: 80-TQFP, 80-VQFP
• For Use With: 497-5518 - EVAL BOARD RFID READER497-5218 - KIT DEVELOPMENT FOR UPSD3400497-2381 - CABLE PROGRAMMER FLASH LINK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-4907

UPSD3422, UPSD3433, UPSD3434, UPSD3454
17.1.4
Alternate functions
There are five SFRs used to control the mapping of alternate functions onto MCU port pins,
and these SFRs are depicted as switches in
●
●
●
Since these SFRs are cleared by a reset, then by default all port pins function as GPIO (not
the alternate function) until firmware initializes these SFRs.
Each pin on each of the three ports can be independently assigned a different function on a
pin-by-pin basis.
The peripheral functions Timer 2, UART1, and I
1 and Port 4 for additional flexibility by giving a wider choice of peripheral usage on a limited
number of device pins.
When the selected alternate function is UART0, UART1, or SPI, then the related pins are in
quasi-bidirectional mode, including the use of the high-side driver for rapid 0-to-1 output
transitions. The high-side driver is enabled for just one MCU_CLK period on 0-to-1
transitions by the delay function at the “digital_alt_func_data_out” signal pictured in
Figure 16 on page 80
If the alternate function is Timer 0, Timer 1, Timer 2, or PCA input, then the related pins are
in quasi-bidirectional mode, but input only.
If the alternate function is ADC, then for each pin the pull-ups, the high-side driver, and the
low-side driver are disabled. The analog input is routed directly to the ADC unit. Only Port 1
supports analog functions
If the alternate function is I
quasi-bidirectional mode but the high-side driver is not enabled for one cycle when
outputting a 0-to-1 transition. Only the low-side driver and the internal weak pull-ups are
used. Only Port 3 supports open-drain mode
an external pull-up resistor on each bus signal, typically 4.7KΩ to V
If the alternate function is PCA output, then the related pins are in push-pull mode, meaning
the pins are actively driven and held to logic '1' by the high-side driver, or actively driven and
held to logic '0' by the low-side driver. Only Port 4 supports push-pull mode
page
current when driving logic '0.' This current is significantly more than the capability of pins on
Port 1 or Port 3 (see
For example, to assign these port functions:
●
●
●
The following values need to be written to the SFRs:
Port 3 uses the SFR, P3SFS
Port 1 uses SFRs, P1SFS0
Port 4 uses SFRs, P4SFS0
Port 1: UART1, ADC[1:0], P1[7:4] are GPIO
Port 3: UART0, I
Port 4: TCM0, SPI, P4[3:1] are GPIO
P1SFS0 = 00001111b, or 0Fh
P1SFS1 = 00000011b , or 03h
P3SFS = 11000011b, or C3h
P4SFS0 = 11110001b, or F1h
P4SFS1 = 11110000b, or F0h
81). Port 4 push-pull pins can source I
Table 211 on page
2
through
C, P3[5:2] are GPIO
(Figure 16 on page
2
C, the related pins will be in open drain mode, which is just like
Figure 18 on page
(Table 43 on page
(Table 46 on page
(Table 41 on page
271).
OH
Figure 15 on page
(Figure 17 on page
80). Port 1 is not 5 V tolerant.
2
current when driving logic '1,' and sink I
C may be split independently between Port
81.
84) and P1SFS1
85) and P4SFS1
84).
80.
81). I
I/O ports of mcu module
CC
(Table 44 on page
(Table 47 on page
2
.
C requires the use of
(Figure 18 on
83/300
OL
84).
85).