APPENDIX
3.1 Electrical characteristics
7540 Group User’s Manual
3-8
(5) Timing Requirements (General purpose)
Table 3.1.7
Timing requirements (1)
(V
CC
= 4.0 to 5.5 V, V
SS
= 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Min.
2
125
50
50
200
80
80
2000
800
800
800
370
370
220
100
1000
400
400
200
200
Typ.
Max.
Symbol
Parameter
Limits
Unit
Reset input “L” pulse width
External clock input cycle time
External clock input “H” pulse width
External clock input “L” pulse width
CNTR
0
input cycle time
CNTR
0
, INT
0
, INT
1
, input “H” pulse width
CNTR
0
, INT
0
, INT
1
, input “L” pulse width
CNTR
1
input cycle time
CNTR
1
input “H” pulse width
CNTR
1
input “L” pulse width
Serial I/O1 clock input cycle time (Note)
Serial I/O1 clock input “H” pulse width (Note)
Serial I/O1 clock input “L” pulse width (Note)
Serial I/O1 input set up time
Serial I/O1 input hold time
Serial I/O2 clock input cycle time
Serial I/O2 clock input “H” pulse width
Serial I/O2 clock input “L” pulse width
Serial I/O2 input set up time
Serial I/O2 input hold time
t
W
(RESET)
t
C
(X
IN
)
t
WH
(X
IN
)
t
WL
(X
IN
)
t
C
(CNTR
0
)
t
WH
(CNTR
0
)
t
WL
(CNTR
0
)
t
C
(CNTR
1
)
t
WH
(CNTR
1
)
t
WL
(CNTR
1
)
t
C
(S
CLK1
)
t
WH
(S
CLK1
)
t
WL
(S
CLK1
)
t
su
(RxD
1
–S
CLK1
)
t
h
(S
CLK1
–RxD
1
)
t
C
(S
CLK2
)
t
WH
(S
CLK2
)
t
WL
(S
CLK2
)
t
su
(S
DATA2
–S
CLK2
)
t
h
(S
CLK2
–S
DATA2
)
μ
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note:
In this time, bit 6 of the serial I/O1 control register (address 001A
16
) is set to “1” (clock synchronous serial I/O1 is selected).
When bit 6 of the serial I/O1 control register is “0” (clock asynchronous serial I/O1 is selected), the rating values are divided by 4.
Table 3.1.8
Timing requirements (2)
(V
CC
= 2.4 to 5.5 V, V
SS
= 0 V, Ta = –20 to 85 °C, unless otherwise noted)
Min.
2
250
100
100
500
230
230
4000
1600
1600
2000
950
950
400
200
2000
950
950
400
400
Typ.
Max.
Symbol
Parameter
Limits
Unit
Reset input “L” pulse width
External clock input cycle time
External clock input “H” pulse width
External clock input “L” pulse width
CNTR
0
input cycle time
CNTR
0
, INT
0
, INT
1
, input “H” pulse width
CNTR
0
, INT
0
, INT
1
, input “L” pulse width
CNTR
1
input cycle time
CNTR
1
input “H” pulse width
CNTR
1
input “L” pulse width
Serial I/O1 clock input cycle time (Note)
Serial I/O1 clock input “H” pulse width (Note)
Serial I/O1 clock input “L” pulse width (Note)
Serial I/O1 input set up time
Serial I/O1 input hold time
Serial I/O2 clock input cycle time
Serial I/O2 clock input “H” pulse width
Serial I/O2 clock input “L” pulse width
Serial I/O2 input set up time
Serial I/O2 input hold time
t
W
(RESET)
t
C
(X
IN
)
t
WH
(X
IN
)
t
WL
(X
IN
)
t
C
(CNTR
0
)
t
WH
(CNTR
0
)
t
WL
(CNTR
0
)
t
C
(CNTR
1
)
t
WH
(CNTR
1
)
t
WL
(CNTR
1
)
t
C
(S
CLK1
)
t
WH
(S
CLK1
)
t
WL
(S
CLK1
)
t
su
(RxD
1
–S
CLK1
)
t
h
(S
CLK1
–RxD
1
)
t
C
(S
CLK2
)
t
WH
(S
CLK2
)
t
WL
(S
CLK2
)
t
su
(S
DATA2
–S
CLK2
)
t
h
(S
CLK2
–S
DATA2
)
μ
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note:
In this time, bit 6 of the serial I/O1 control register (address 001A
16
) is set to “1” (clock synchronous serial I/O1 is selected).
When bit 6 of the serial I/O1 control register is “0” (clock asynchronous serial I/O1 is selected), the rating values are divided by 4.