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ST72371 датащи(PDF) 28 Page - STMicroelectronics

номер детали ST72371
подробное описание детали  8-BIT MCUs WITH 16K ROM/OTP/EPROM,512 BYTES RAM, ADC, DAC (PWM), TIMER, I2C AND SCI
PDF  94 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72371 датащи(HTML) 28 Page - STMicroelectronics

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ST72371/ST72372
I/O PORTS (Cont’d)
4.1.3 Register Description
DATA REGISTERS (DR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D7-D0 Data Register 8 bits.
The behaviour of the DR register depends on the
selected input/output configuration. Writing the DR
register is always taken in account even if the pin
is configured as an input. Reading the DR register
returns either the DR register latch content (pin
configured as output) or the digital value applied to
the I/O pin (pin configured as input).
DATA DIRECTION REGISTERS (DDR)
Read/Write
Reset Value: 0000 0000 (00h) (input mode)
Bit 7:0 = DD7-DD0
Data Direction Register 8 bits.
The DDR register gives the input/output direction
configuration of the pins. Each bit is set and
cleared by software.
0: Input mode
1: Output mode
OPTION REGISTER (OR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = AD[7:0] Port B Digital/Analog Input Con-
figuration Bits.
0: The pull-up is connected and pin configured as
digital input (reset condition)
1: The pull-up is disconnected and the pin is con-
figured as analog input.
70
D7
D6
D5
D4
D3
D2
D1
D0
70
DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0
70
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0



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