at90ls8535-8mi ATMEL Corporation, at90ls8535-8mi Datasheet - Page 86
at90ls8535-8mi
Manufacturer Part Number
at90ls8535-8mi
Description
8-bit Microcontroller With 8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.AT90LS8535-8MI.pdf
(127 pages)
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Port D
86
AT90S/LS8535
Figure 60. Port C Schematic Diagram (Pins PC7)
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
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
Alternate Function
RXD (UART Input line)
TXD (UART Output line)
INT0 (External interrupt 0 input)
INT1 (External interrupt 1 input)
OC1B (Timer/Counter1 output compareB match output)
OC1A (Timer/Counter1 output compareA match output)
ICP (Timer/Counter1 input capture pin)
OC2 (Timer/Counter2 output compare match output)
1041H–11/01
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