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EM6620WS11 データシート(PDF) 17 Page - EM Microelectronic - MARIN SA

部品番号 EM6620WS11
部品情報  Ultra Low Power Microcontroller with 4x8 LCD Driver
PDF  56 Pages
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メーカー  EMMICRO [EM Microelectronic - MARIN SA]
ホームページ  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6620WS11 データシート(HTML) 17 Page - EM Microelectronic - MARIN SA

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EM6620
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© 2005, EM Microelectronic-Marin SA
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www.emmicroelectronic.com
6.4 Port B
The EM6620 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.
6.4.1 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 11 for details.
While the dynamic input comparator is selected (PB0CompSel =‘1’) the PPB[0] input is cut off, a read on port
B PPB[0] returns ‘1’.
Figure 11. Port B Architecture
IRQPB0Comp
PB0CompResult
Port B Direction Reg
PortB Data Reg
Internal Data Bus
MUX
Active
Pull-down
I / O Terminal
PB[n]
DDR[n]
DR[n]
DB[n]
RD
PB0CompSelect for PB[0]
RD for PB[3:1]
Multiplexed
Output
Multiplexed
Output Active
Multiplexed
Outputs are:
PWM, CK[16],
CK[11], CK[1]
Port B
Control
Active Pull-up if
Open Drain
Mode
SLEEP
Pd[n]
Pull-down
Option Register
OD[n]
Open Drain Option
Register
Mask Option
MPBPD[n]
PB0CompEnable
Mask Option
MPBPD[n]
Dynamic Input
Comparator
1
4



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