EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 77

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

Copyright  2003 EM Microelectronic-Marin SA
4.2.
4.3.
4.4.
4.5.
Port B is a bitwise select input output port. The state of port B (address 075H) 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
076H) 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 4-3.
Port C can be configured as either a 4 bit input port or a 4 bit output port (bit 1
address 07CH). The possible combinations for the LED and button states are the
same as for port B and are shown in Table 4-3. Port C has maskable interrupt
capabilities (address 079H). The state of the interrupt mask is show next to the port
and can have the states shown in Table 4-2.
Port D can be configured as either a 4 bit input port or a 4 bit output port (bit 2 address
07CH). When port D is set to output and serial write mode is selected (bit3 address
068H) the serial clock is output on port D0 and the serial data on port D1. The
possible combinations for the LED and button states for port D are shown in Table
4-3. When in serial write mode the symbol « NC » is replaced by « SCK » (serial
clock) for port D0 and « SD » (serial data) for port D1.
Port E is a bitwise select input output port. The state of port E (address 066H) is
shown by the LED and buttons. The possible combinations for the LED and button
states are the same as for port B and are shown in Table 4-3. When the port is input
the state can be changed using the corresponding push buttons. When the port is
set to output (address 067H) the button is set to NC (not connected) and the LED
indicates the state of the output port. The button is set COMP when the comparator
is selected (bit 0 address 07BH)
LED state
Port B
Port C
Port D / Serial Write Buffer
Port E
Red
Yellow
Red
Yellow
Table 4-3 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
13
Peripheral Interface
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EM66xx
Binder 4.3-01/03 Rev. B/495