EM6580SO14A EMMICRO [EM Microelectronic - MARIN SA], EM6580SO14A Datasheet - Page 19

• Manufacturer Part Number: EM6580SO14A
• Description: Ultra Low Power 8-pin Flash Microcontroller
• Manufacturer: EMMICRO [EM Microelectronic - MARIN SA]

6.3 PortA as Output and its Multiplexing
The EM6580 can have up to 4 (5 in Die form or 14-pin package) bit general purpose CMOS or N-channel Open
Drain Output ports. Table 6.1.1 Input and Output ports overview shows all the possibilities. Figure 12 shows
the output architecture and possible output signals together with software controlled pull-up and pull-down
resistors which are disconnected when the port is an output and in a defined state, to preclude additional
consumption.
The output multiplexing registers are RegPACntl3 and RegPACntl4.
Figure 10. Port A Architecture (Outputs)
6.3.1 CMOS / Nch. Open Drain Output
The port A outputs can be configured as either CMOS or Nch. open drain outputs. In CMOS both logic ‘1’ and
‘0’ are driven out on the terminal. In Nch. Open Drain only the logic ‘0’ is driven on the terminal, the logic ‘1’
value is defined by the internal pull-up resistor (if implemented), or high impedance.
Figure 11. CMOS or Nch. Open Drain Outputs
NOTE: State of I/O pads may not be defined until V
Copyright © 2006, EM Microelectronic-Marin SA
Other Outputs
Out Mux Control
Daout[n]
supplied by V
This time depends on how fast capacitor on V
CMOS Output
Multiplexed Outputs from:
- Serial Interface
- PWM, frequency out.
- System Reset
R
Output Enable Register
Port A Data Register
(OEnPA[n])
Mux
(PAout[n])
OE[n]
out[n]
Tri-State Output
reg
Buffer is Closed
clears them to Inputs.
To Irq, Reset, Clock, etc
PA[5,3:0]
Output Mux Registers
I/O Terminal
mux[n]
Read Port A
reg
reg
Pd[n]
Pull-down Register
is charged and typ. it can be in range of couple of ms.
reaches typ. 0.8V and Power-On-Reset logic
(NoPdPA[n])
Other Outputs
Out Mux Control
19
Daout[n]
Block Input (Low)
Input / Output
Control Logic
Port A
Nchannel Open Drain Output
Mux
Register (NchOpPA[n])
OD[n]
Open Drain Control
Tri-State Output
Impedance for
Buffer : High
Data = ‘1’
Vdd
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PA[5,3:0]
PA[5,3:0]
EM6580
I/O Terminal
Vdd
Active Pull-up
for High State
Vdd
Active Pull-up
Pull-down
in Nch. Open
Drain Mode
MAPu[n]
MAPd[n]
Active
Option
Option
Metal
Metal