EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 85

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

Copyright  2003 EM Microelectronic-Marin SA
6.2.
6.3.
Port B is a bitwise select input output port. The state of port B (address 052H) is
shown by the LED and buttons. When the port is input the state can be changed
using the corresponding push buttons. When the port is set to output (address
051H) the button is set to NC (not connected) and the LED indicates the state of the
output port. Consequently the possible combinations for the LED and button states
are shown in Table 6-3.
The state of the 1Hz, 32Hz and Blink interrupt masks are shown. The symbol
indicates that the interrupt mask is active and the symbol
interrupt mask is inactive.
LED state
Port B
Prescaler
Red
Yellow
Red
Yellow
Table 6-3 Possible states for input output port B.
Button
NC
NC
H
L
State
Port input and high
Port input and low
Port output and high
Port output and low
21
Peripheral Interface
indicates that the
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Binder 4.3-01/03 Rev. B/495