M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 60
M37702E6BFS
Manufacturer Part Number
M37702E6BFS
Description
EPROM MCU/8BIT CMOS EMULATION CH
Manufacturer
Renesas Electronics America
Datasheet
1.M37702E6BFS.pdf
(524 pages)
Specifications of M37702E6BFS
Accessory Type
Emulator EPROM MCU
For Use With/related Products
7702
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M37702E6BFS
Manufacturer:
MITSUBISHI/三菱
Quantity:
20 000
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INPUT/OUTPUT PINS
3.1 Programmable I/O ports
3–4
3.1.2 Port register
Data is input/output to/from externals by writing/reading data to/from the port register. The port register
consists of a port latch which holds the output data and a circuit which reads the pin state. Each bit of the
port register corresponds one for one to each pin of the microcomputer. Figure 3.1.3 shows the structure
of the port Pi (i = 0 to 8) register.
When outputting data from programmable I/O ports set to output mode
When inputting data from programmable I/O ports set to input mode
By reading the port register of a port set to output mode, the contents of the port latch is read out,
instead of the pin state. Accordingly, the output data is correctly read without being affected by an
external load. (Refer to Figures 3.1.4 and 3.1.5.)
By writing data to the port register of a programmable I/O port set to input mode, the data is only
written into the port latch and is not output to externals. The pin retains floating.
read out.
By writing data to the corresponding bit of the port register, the data is written into the port latch.
The data is output from the pin according to the contents of the port latch.
By reading the corresponding bit of the port register, the data which is input from the pin can be
The pin which is set to input mode enters the floating state.
7702/7703 Group User’s Manual
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