EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 102

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

Copyright  2003 EM Microelectronic-Marin SA
9.2.2. Port 2
9.2.3. Port 3
The state of the interrupt mask for port 1 is shown next to the button.
The possible interrupt mask states (for any ports with interrupt capabilities) are
shown in Table 9-2.
Table 9-2 Representation of possible IRQ mask states.
Rotation detection and M-Signal interrupts are special ones in that they are
generated as a combined result of bits 0 and 1 and this is shown by means of the
rectangular frame surrounding the IRQ symbols for these bits
(see 2).
Port 2 is an input port with only one general Interrupt (Positive edge « ored »). The
state of port 1 is shown by the LED’s and can be changed by depressing the
Buttons. See Table 9-1.
Port 3 is a block select input/output Port with no Interrupt generating capabilities.
Bits 0 to 2 are block select as Input or Output (RegPIOCntl-0) and Bit 3 is
undependable select as Input or Output (RegPIOCntl-2). The possible states of Port
3 are shown in Table 9-3.
LED state
Symbol
Red
Yellow
Red
Yellow
State
Interrupt generated on the falling edge of the port
Interrupt generated on the rising edge of the port
Interrupt disabled
Interrupt generated on both edges
Interrupt generated by change in rotation direction
Interrupt generated by M-signal
Table 9-3 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
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Peripheral Interface
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