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EM6617 Datasheet(PDF) 17 Page - EM Microelectronic - MARIN SA

Part No. EM6617
Description  Ultra Low Power Microcontroller with ADC AND EEPROM
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6617 Datasheet(HTML) 17 Page - EM Microelectronic - MARIN SA

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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
17
www.emmicroelectronic.com
7.4 Port B
The EM6617 has one four bit general purpose I/O port. Each bit can be configured individually by software for
input/output, pull-up, pull-down and
CMOS or
Nch. open drain output type. The port outputs either data,
frequency or PWM signals.
7.4.1 Input / Output Mode
Each port B terminal is bit-wise bi-directional. The input or output mode on each port B terminal is set by writing
the corresponding bit in the
RegPBCntl control register. To set for input (default), 0 is written to the corresponding
bit of the
RegPBCntl register which results in a high impedance state for the output driver. The output mode is set
by writing 1 in the control register, and consequently the output terminal follows the status of the bits in the
RegPBData register.
The port B terminal status can be read on address
RegPBData even in output mode. Be aware that the data read
on port B is not necessary of the same value as the data stored on
RegPBData register.
See also Figure 13 for details.
Figure 13. Port B Architecture
Open Drain Option
Register
Port B Direction Register
Port B Data Register
Internal Data Bus
MUX
Active
Pull-down
I / O Terminal
PB[n]
PBIOCntl[n]
PBData[n]
DB[n]
Read
Read for PB[3:0]
Multiplexed
Output
Multiplexed
Output Active
Multiplexed
Outputs are:
PWM, Ck[11],
Ck[16], Ck[12]
Port B
Control
Active Pull-up
in Nch. Open
Drain Mode
Read
NoPdPB[n]
Pull-down
Option Register
NchOpDPB[n]
mask option
MPBPD[n]
Mask Option
MPBPD[n]
4


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