M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 436

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 20.4.1 Procedure of port Pi (i = 3, 4, 6, 7, 8) direction register
7703 GROUP
20.4 Functional description
20–6
20.4.1 I/O pin
The M37703 does not have the following pins of the M37702:
•Port P3
•Ports P4
•Ports P6
•Ports P7
•Ports P8
(1) Port direction register
(2) Memory expansion and Microprocessor modes
to “1.” All products of the M37703 need this procedure. Do it regardless of the product type and the
used mode.
shown by Figure 20.4.1 in the initial setting program after reset. Do not write “0” after that to the bits
to be fixed to “1.”
however, those pins are not used. The above explanation is independent of that example explanation.
Fix the bits of port Pi (i = 3, 4, 6, 7, 8) direction register which do not have the corresponding pins
All bits of port Pi direction register are cleared to “0” after reset. Accordingly, follow the procedure
Paragraph “1.3.1 Example for processing unused pins” explains the examples when there are pins,
The M37703 does not have the HLDA pin, so that the HLDA signal cannot be used in those modes.
Notes 1: When executing the instruction to write to bits 4 to 7 of Port P3 direction register, the value cannot be
3
3
0
3
4
, P6
, P8
Be sure to set “1” to the bit indicated by using “1”.
Though these bits do not have the corresponding pins, follow the above procedure.
The above procedure is necessary whether or not other programmable I/O ports are
used.
to P4
to P7
2: The bits which are not indicated by using “1” and bits 4 to 7 of Port P3 direction register function as a
1
5
written into them.
programmable I/O port. Just as in ports P0–P2 and P5, set “0” when using as an input port, and set “1”
when using as an output port.
When reading to those bits, “0” is read.
, P6
6
6
6
, P6
1 1
b7
7
b6
1 1 1 1
1 1 1 1
b5
1 1
b4
b3
1
_____
b2
7702/7703 Group User’s Manual
1 1
b1
b0
Port P6 direction register (address 10
Port P7 direction register (address 11
Port P3 direction register (address 9
Port P4 direction register (address C
Port P8 direction register (address 14
_____
16
16
16
16
16
)
)
)
)
)