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ST7263B Datasheet(PDF) 6 Page - STMicroelectronics

No. de pieza ST7263B
Descripción Electrónicos  LOW SPEED USB 8-BIT MCU FAMILY WITH FLASH/ROM, UP TO 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I짼C
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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PIN DESCRIPTION (Cont’d)
RESET (see Note 1): Bidirectional. This active low
signal forces the initialization of the MCU. This
event is the top priority non maskable interrupt.
This pin is switched low when the Watchdog is trig-
gered or the VDD is low. It can be used to reset ex-
ternal peripherals.
OSCIN/OSCOUT:
Input/Output Oscillator
pin.
These pins connect a parallel-resonant crystal, or
an external source, to the on-chip oscillator.
VDD/VSS (see Note 2): Main Power Supply and
Ground voltages.
VDDA/VSSA (see Note 2): Power Supply and
Ground voltages for analog peripherals.
Alternate Functions: Several pins of the I/O ports
assume software programmable alternate func-
tions as shown in the pin description.
Note 1: Adding two 100 nF decoupling capacitors
on the Reset pin (respectively connected to VDD
and V
SS) will significantly improve product electro-
magnetic susceptibility performance.
Note 2: To enhance the reliability of operation, it is
recommended that VDDA and VDD be connected to-
gether on the application board. This also applies
to VSSA and VSS.
Table 2. Device Pin Description
Pin n°
Pin Name
Level
Port / Control
Main
Function
(after reset)
Alternate Function
Input
Output
11
VDD
S
Power supply voltage (4V - 5.5V)
2
2
OSCOUT
O
Oscillator output
3
3
OSCIN
I
Oscillator input
44
VSS
S
Digital ground
5
5
PC2/USBOE
I/O
CT
X
X
Port C2
USB Output Enable
6
6
PC1/TDO
I/O
CT
X
X
Port C1
SCI Transmit Data Output*
7
7
PC0/RDI
I/O
CT
X
X
Port C0
SCI Receive Data Input*
8
8
RESET
I/O
X
X
Reset
--
9
NC
--
Not connected
9
10 PB7/AIN7/IT8
I/O CT 10mA X
XX
X
Port B7
ADC analog input 7
10 11 PB6/AIN6/IT7
I/O CT 10mA X
XX
X
Port B6
ADC analog input 6
11 12 VPP/TEST
S
Programming supply
12 13 PB5/AIN5/IT6
I/O CT 10mA X
XX
X
Port B5
ADC analog input 5
13 14 PB4/AIN4/IT5
I/O CT 10mA X
XX
X
Port B4
ADC analog input 4
14 15 PB3/AIN3
I/O CT 10mA X
XX
Port B3
ADC analog input 3
15 16 PB2/AIN2
I/O CT 10mA X
XX
Port B2
ADC analog input 2
16 17 PB1/AIN1
I/O CT 10mA X
XX
Port B1
ADC analog input 1
17 18 PB0/AIN0
I/O CT 10mA X
XX
Port B0
ADC Analog Input 0
18 19 PA7/OCMP2/IT4
I/O
CT
X
XX
Port A7
Timer Output Compare 2
19 20 PA6/OCMP1/IT3
I/O
CT
X
XX
Port A6
Timer Output Compare 1
20 21 PA5/ICAP2/IT2
I/O
CT
X
XX
Port A5
Timer Input Capture 2
21 22 PA4/ICAP1/IT1
I/O
CT
X
XX
Port A4
Timer Input Capture 1


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