EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 70

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

2.
Copyright  2003 EM Microelectronic-Marin SA
EM6503 & EM6505
2.1.
The peripheral interface module for the EM6503 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 072H) and can have
values shown in Table 2-1.
to change the state of the port click on the corresponding button.
The state of the interrupt mask for port A (address 073H) is shown next to the
button. The possible interrupt mask states are shown in Table 2-2.
LED state
Port A
Symbol
Red
Yellow
Fig. 2-1 Peripheral interface for the EM6503 microcontroller
State
Interrupt generated on the falling edge of the port
Interrupt generated on the rising edge of the port
Interrupt disabled
Table 2-2 Representation of possible IRQ mask states.
Table 2-1 Possible input port states
Button
H
L
State
Port high
Port low
6
Peripheral Interface
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EM66xx
Binder 4.3-01/03 Rev. B/495