M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 26

• 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

DESCRIPTION
1.3 Pin description
Table 1.3.5 Example for processing unused pins in memory expansion mode
Fig. 1.3.2 Example for processing unused pins in memory expansion mode
1–10
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 (Note 6)
X
HOLD, RDY (Note 8)
AVcc
AVss, V
_____
OUT
(2) In memory expansion 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: Set the P4
8: When processing unused pins, use the possible shortest wiring (within 20 mm from the microcomputer).
____
REF
2
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.
as ports P4
to P4
•Ports P4
7
, P5 to P8
2
/
3
3
Pin name
–P4
–P4
1
pin to the P4
6
7
When setting ports for input mode
, P6
, P5–P8.
_____
P4
0
, P6
2
–P4
7
, P5–P8
1
HOLD
HLDA
AV
, P6
RDY
AV
BHE
X
V
ALE
2
OUT
REF
CC
SS
function (clock
7702/7703 Group User’s Manual
6
, P6
Left open
Left open
V
7
CC
, 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, 7)
Leave them 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.
1
6
, P8
output disabled), and perform the same processing
4
When setting ports for output mode
, P8
5
P4
2
–P4
Example of processing
7
, P5–P8
HLDA
HOLD
AV
BHE
RDY
X
AV
ALE
V
OUT
REF
CC
SS
IN
Left open
Left open
Left open
pin.
V
CC
V
SS