M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 279

• 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

12.2 Software Wait
Software Wait provides a function to facilitate access to external devices that require a long access time.
To select the software Wait, use the wait bit (bit 2 at address 5E
the processor mode register (address 5E
software Wait is used.
Software Wait is valid only for the external area. The internal areas is always accessed with no Wait.
Fig. 12.2.1 Structure of processor mode register
b7
b6
0
b5
b4
b3
b2
CONNECTION WITH EXTERNAL DEVICES
b1
b0
Processor mode register (Address 5E
Notes 1: While supplying the Vcc level to the CNVss pin, bit 1 becomes “1”
Bit
2
3
5
0
1
4
6
7
2: Bit 7 is ignored in the microprocessor mode. (It may be either “0” or “1.”)
Processor mode bits
Wait bit
Software reset bit
Clock
Interrupt priority detection time
select bits
Fix this bit to “0.”
after a reset. (Fixed to “1.”)
: Bits 3 to 6 are not used when accessing the external area.
7702/7703 Group User’s Manual
16
1
). Figure 12.2.2 shows an example of bus timing when the
output select bit
Bit name
(Note 2)
16
b5 b4
0 0 : 7 cycles of
0 1 : 4 cycles of
1 0 : 2 cycles of
1 1 : Not selected
b1 b0
0 : Software Wait is inserted when
1 : No software Wait is inserted
The microcomputer is reset by
writing “1” to this bit. The value is
“0” at reading.
0 : Clock
1 : Clock
0 0 : Single-chip mode
0 1 : Memory expansion mode
1 0 : Microprocessor mode
1 1 : Not selected
)
(P4
(P4
put pin.)
accessing external area.
when accessing external area.
I/O port.)
16
2
2
). Figure 12.2.1 shows the structure of
functions as a programmable
functions as a clock
1
1
Functions
output disabled
output enabled
12.2 Software Wait
1
out-
(Note1)
At reset
0
0
0
0
0
0
0
0
RW
RW
RW
RW
WO
RW
RW
RW
RW
12–11