EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 112

• Manufacturer Part Number: EMS6500
• Description: Microcontroller Development System 4-bit (Emmon), Simulators 4-bit
• Manufacturer: EM Microelectronic

11. EM6580
Copyright  2003 EM Microelectronic-Marin SA
11.1. Port A
The peripheral interface module for the EM6580 is shown below.
Fig. 12-1 Peripheral interface for the EM6580 microcontroller
Port A is a bitwise select input output port excepted PA4 always in input mode. The
state of port A (address 050H and address 060H) is shown by the LED and buttons.
When the port is input the state can be changed using the corresponding push
buttons. When the port is set to output (address 051H and address 060H) the button
is set to NC (not connected) and the LED indicates the state of the output port.
Consequently the possible combinations for the LED and button states are shown in
Table 12-2.
Port A ,when configured in input, has individual maskable interrupts on PA0, PA3,
PA4, PA5. The state of the interrupt mask for port A (address 067H) is shown next
to the button. The possible interrupt mask states are shown in Table 12-3.
LED state
Red
Yellow
Red
Yellow
Table 12-2 Possible states for input output port.
Button
NC
NC
H
L
State
Port input and high
Port input and low
Port output and high
Port output and low
48
Peripheral Interface
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EM66xx
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