EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 88
EMS6500
Manufacturer Part Number
EMS6500
Description
Microcontroller Development System 4-bit (Emmon), Simulators 4-bit
Manufacturer
EM Microelectronic
Datasheet
1.EMS6500.pdf
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7.
Copyright 2003 EM Microelectronic-Marin SA
EM6521 & EM6522
7.1.
The peripheral interface module for the EM6522 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 7-1.
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 7-2.
Table 7-2 Representation of possible IRQ mask states.
LED state
Port A
Symbol
Red
Yellow
Fig. 7-1 Peripheral interface for the EM6522 microcontroller
Table 7-1 Possible input Table port states
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
24
Peripheral Interface
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EM66xx
Binder 4.3-01/03 Rev. B/495
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