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AT90S8535 Datasheet(PDF) 86 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 86 Page - ATMEL Corporation

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AT90S/LS8535
1041H–11/01
Figure 60. Port C Schematic Diagram (Pins PC7)
Port D
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors.
Three I/O memory address locations are allocated for Port D, one each for the Data
Register – PORTD, $12($32), Data Direction Register – DDRD, $11($31) and the Port D
Input Pins – PIND, $10($30). The Port D Input Pins address is read-only, while the Data
Register and the Data Direction Register are read/write.
The Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally
pulled low will source current if the pull-up resistors are activated. Some Port D pins
have alternate functions as shown in Table 33.
Table 33. Port D Pin Alternate Functions
Port Pin
Alternate Function
PD0
RXD (UART Input line)
PD1
TXD (UART Output line)
PD2
INT0 (External interrupt 0 input)
PD3
INT1 (External interrupt 1 input)
PD4
OC1B (Timer/Counter1 output compareB match output)
PD5
OC1A (Timer/Counter1 output compareA match output)
PD6
ICP (Timer/Counter1 input capture pin)
PD7
OC2 (Timer/Counter2 output compare match output)


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