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ST7261 датащи(PDF) 28 Page - STMicroelectronics

номер детали ST7261
подробное описание детали  LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, ROM MEMORY, LVD, WDG, TIMER
PDF  80 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7261 датащи(HTML) 28 Page - STMicroelectronics

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I/O PORTS (Cont’d)
8.2.7 Register Description
DATA REGISTER (DR)
Port x Data Register
PxDR with x = A or B.
Read /Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = D[7:0]
Data register 8 bits.
The DR register has a specific behaviour accord-
ing to the selected input/output configuration. Writ-
ing the DR register is always taken into account
even if the pin is configured as an input; this allows
to always have the expected level on the pin when
toggling to output mode. 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 REGISTER (DDR)
Port x Data Direction Register
PxDDR with x = A or B.
Read /Write
Reset Value: 0000 0000 (00h)
Bit 7:0 = DD[7:0]
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
70
D7
D6
D5
D4
D3
D2
D1
D0
70
DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0



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