M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 25

• 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

Table 1.3.4 Example for processing unused pins in single-chip mode
Notes 1: When setting these ports to the output mode and leave them open, they remain set to the input
Fig. 1.3.1 Example for processing unused pins in single-chip mode
Ports P0 to P8
E
X
AVcc
AVss, V
_
shall modify them according to the user’s actual application and test them.
1.3.1 Example for processing unused pins
Examples for processing unused pins are described below. These descriptions are just examples. The user
OUT
(1) In single-chip mode
(Note 2)
2: This applies when a clock externally generated is input to the X
3: In the 7703 Group, the following ports does not have the corresponding pins and have only the
REF
mode until they are switched to the output mode by software after reset. While ports remain set
to the input mode, consequently, voltage levels of pins are unstable, and a power source current
can increase.
The contents of the direction register can be changed by noise or a program runaway generated
by noise. To improve its reliability, we recommend to periodically set the contents of the direction
register by software.
When processing unused pins, use the possible shortest wiring (within 20 mm from the microcomputer).
direction registers. Fix the bit of these direction registers to “1” (output mode).
, BYTE
•Ports P3
When setting ports for input mode
3
Pin name
, P4
3
–P4
P0–P8
BYTE
AV
AV
X
V
6
OUT
REF
, P6
CC
SS
E
0
, P6
Left open
7702/7703 Group User’s Manual
1
, P6
V
CC
6
, P6
V
SS
7
, P7
Set for input mode and connect these pins to Vcc or
Vss via a resistor; or set for output mode and leave
these pins open. (Notes 1, 3)
Leave it open.
Connect this pin to Vcc.
Connect these pins to Vss.
3
–P7
When setting ports for output mode
6
, P8
4
, P8
Example of processing
5
P0–P8
IN
BYTE
AV
AV
X
V
pin.
DESCRIPTION
OUT
REF
CC
SS
E
1.3 Pin description
Left open
Left open
V
CC
V
SS
1–9