EM6607 EM Microelectronic, EM6607 Datasheet - Page 19

• Manufacturer Part Number: EM6607
• Description: Ultra-low power microcontroller
• Manufacturer: EM Microelectronic

7.5
PortE is a 4-bit I/O port where each pad PE(0:3) can be separately configured by software to be either input or output by
writing to the corresponding bit of the CIOPortE control register. The PortE register is used to read data when in input mode
and to write data when in output mode. On each terminal controlled Pull-Up/Down resistor can be selected by metal option
which are active only when selected as input. Special case is when we want to use internal Strong pull-up resistor also when
PortC terminal is declared as N-channel open drain output and internal pull-up resistor is used to pull up the output (not-
controlled pull-up). This is a special option “sod” = strong pull-up for Open drain- active all the time (when terminal is input or
output).
Input mode is set by writing 0 to the corresponding bit in the CIOPortE register. This results in a high impedance state with
the status of the pin being read from register PortE. Output mode is set by writing 1 to the corresponding bit in the CIOPortE
register. Consequently the output terminal follows the status of the bits in the PortE register. At initial RESET the CIOPortE
register is set to 0, thus setting the port to an input.
7.5.1
Table 25.
Table 26.
Figure 11.
Copyright © 2005, EM Microelectronic-Marin SA
Bit
3
2
1
0
Bit
3
2
1
0
PortE
PortE registers
PE[3:0]
PortE Input/Output status register - PortE
PortE Input/Output control register - CIOPortE
Port E
R
Name
PE3
PE2
PE1
PE0
Name
CIOPE3
CIOPE2
CIOPE1
CIOPE0
0
1
option
option
Mask
Mask
Vdd
Reset
-
-
-
-
Reset
0
0
0
0
2Y
2N
R/W
R/W
R /W
R/W
R /W
R/W
R/W
R/W
R/W
R/W
option
option
Mask
Mask
PG
NG
OE
Description
PE3 I/O data
PE2 I/O data
PE1 I/O data
PE0 I/O data
Description
PE3 Input/Output select
PE2 Input/Output select
PE1 Input/Output select
PE0 Input/Output select
D
19
PortE RD
CIOPE
Port E
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