EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 73

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

3.
Copyright  2003 EM Microelectronic-Marin SA
EM6504
3.1.
3.2.
The peripheral interface module for the EM6504 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 3-1
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 3-2.
Port B is an output only port. The LED’s indicates the state of the port. A red LED
indicates the port is high (logical 1) and a yellow LED indicates the port is low
(logical 0). The output directly corresponds to the register 078H.
LED state
Port A
Symbol
Port B
Red
Yellow
fig 3-1 Peripheral interface for the EM6504 microcontroller
Table 3-1 Possible input Table port states
Table 3-2 Representation of possible IRQ mask 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
9
Peripheral Interface
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EM66xx
Binder 4.3-01/03 Rev. B/495