EMS6500 EM Microelectronic, EMS6500 Datasheet - Page 103

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

Copyright  2003 EM Microelectronic-Marin SA
9.2.4. Port 4
9.2.5. Port 5
9.2.6. Serial Interface
Port 4 is very similar to Port 3. Bits 0 to 2 are block select as Input or Output
(RegPIOCntl-1) and Bit 3 is undependable select as Input or Output (RegPIOCntl-
3). The possible states of Port 4 are shown in Table 9-3
Port 5 is a general, bit select, input/output Port with no Interrupt capabilities. The
direction of each bit is programmable by means of RegP5Cntl. ). The possible
states of Port 5 are shown in Table 9-3.
Port 5 can also function as Serial Port.
If RegSIOCntl-1 is « 1 », then Port 5 will function as Serial Interface (SIO). In this
case, the names of the bits change to those shown in
Fig. 9-2 and explained in Table 9-4.
Note: For a more detailed description of the different Port Serial modes, consult your
Controller Manual
Port-bit Function
RDY
OUT
CLK
IN
Serial Data In
Status - Chip select (bit 2 reg.054H)
Serial Data Out
Serial Clock
Fig. 9-2. Port 5 configured as Serial Port
Table 9-4 Serial port states
39
Peripheral Interface
Possible states
Input
Output
Output
Output in master mode
Input in slave mode
www.emmicroelectronic.com
EM66xx
Binder 4.3-01/03 Rev. B/495