EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 84

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EMS6500

Manufacturer Part Number
EMS6500
Description
Microcontroller Development System 4-bit (Emmon), Simulators 4-bit
Manufacturer
EM Microelectronic
Datasheet
6.
Copyright  2003 EM Microelectronic-Marin SA
EM6520
6.1.
The peripheral interface module for the EM6520 is shown below.
Port A is an input port with individual maskable interrupts. The circular LED’s as well
as the push buttons indicates the state of port A (address 050H) and can have
values shown in Table 6-1.
to change the state of the port click on the corresponding button.
The state of the interrupt mask for port A (address 065H) is shown next to the
button. The possible interrupt mask states are shown in Table 6-2.
LED state
Port A
Symbol
Red
Yellow
Fig. 6-1 Peripheral interface for the EM6520 microcontroller
Table 6-2 Representation of possible IRQ mask states.
Table 6-1 Possible states of input port A
State
Interrupt generated on the falling edge of the port
Interrupt generated on the rising edge of the port
Interrupt disabled
Button
H
L
State
Port high
Port low
20
Peripheral Interface
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EM66xx
Binder 4.3-01/03 Rev. B/495

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