M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 27

• 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. 1.3.3 Example for processing unused pins in microprocessor mode
Table 1.3.6 Example for processing unused pins in microprocessor mode
Notes 1: When setting these ports to the output mode and leave them open, they remain set to the input
Ports P4
____
BHE (Note 2)
ALE (Note 3)
_____
HLDA,
X
HOLD, RDY (Note 7)
AVcc
AVss, V
_____
OUT
(3) In microprocessor mode
(Note 5)
2: This applies when “H” level is input to the BYTE pin.
3: This applies when “H” level is input to the BYTE pin and the access space is 64 Kbytes.
4: When supplying Vss level to the CNVss pin, these pins remain set to the input mode until they
5: This applies when a clock externally generated is input to the X
6: In the 7703 Group, the following ports does not have the corresponding pins and have only the
7: When processing unused pins, use the possible shortest wiring (within 20 mm from the microcomputer).
____
REF
1
3
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).
are switched to the output mode by software after reset. While pins remain set to the input mode,
consequently, voltage levels of pins are unstable, and a power source current can increase.
direction registers. Fix the bit of these direction registers to “1” (output mode).
There is not the HLDA pin.
(Note 6)
to P4
•Ports P4
7
, P5 to P8
3
Pin name
–P4
When setting ports for input mode
6
, P6
_____
P4
3
–P4
0
, P6
7
, P5–P8
HOLD
HLDA
RDY
AV
BHE
AV
X
ALE
V
OUT
REF
CC
SS
1
1
, P6
Left open
Left open
7702/7703 Group User’s Manual
6
, P6
V
CC
7
, P7
V
SS
3
–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, 6)
Leave it open. (Note 4)
Leave it open.
Connect these pins to Vcc via a resistor (pull-up).
Connect this pin to Vcc.
Connect these pins to Vss.
6
, P8
When setting ports for output mode
4
, P8
P4
3
5
–P4
7
, P5–P8
Example of processing
HOLD
HLDA
AV
BHE
RDY
AV
ALE
X
V
OUT
REF
CC
SS
1
IN
Left open
Left open
Left open
pin.
DESCRIPTION
V
CC
1.3 Pin description
V
SS
1–11