Document Number: 002-04721 Rev.*A
Page 49 of 74
MB966B0 Series
14.4.8 USART Timing
(V
CC
= AV
CC
= 2.7V to 5.5V, V
SS
= AV
SS
= 0V, T
A
= - 40°C to + 125°C, C
L
=50pF)
Parameter
Symbo
l
Pin
name
Conditions
4.5V
V
CC
5.5V
2.7V
V
CC
4.5V
Unit
Min
Max
Min
Max
Serial clock cycle time
t
SCYC
SCKn
Internal shift
clock mode
4t
CLKP1
-
4t
CLKP1
-
ns
SCK
SOT delay time
t
SLOVI
SCKn
,
SOTn
- 20
+ 20
- 30
+ 30
ns
SOT
SCK
delay time
t
OVSHI
SCKn
,
SOTn
N
t
CLKP1
– 20
*
-
N
t
CLKP1
– 30
*
-
ns
SIN
SCK
setup time
t
IVSHI
SCKn
,
SINn
t
CLKP1
+ 45
-
t
CLKP1
+ 55
-
ns
SCK
SIN hold time
t
SHIXI
SCKn
,
SINn
0
-
0
-
ns
Serial clock "L" pulse width
t
SLSH
SCKn
External
shift
clock mode
t
CLKP1
+ 10
-
t
CLKP1
+ 10
-
ns
Serial clock "H" pulse width
t
SHSL
SCKn
t
CLKP1
+ 10
-
t
CLKP1
+ 10
-
ns
SCK
SOT delay time
t
SLOVE
SCKn
,
SOTn
-
2t
CLKP1
+ 45
-
2t
CLKP1
+ 55
ns
SIN
SCK
setup time
t
IVSHE
SCKn
,
SINn
t
CLKP1
/2
+ 10
-
t
CLKP1
/2
+ 10
-
ns
SCK
SIN hold time
t
SHIXE
SCKn
,
SINn
t
CLKP1
+ 10
-
t
CLKP1
+ 10
-
ns
SCK fall time
t
F
SCKn
-
20
-
20
ns
SCK rise time
t
R
SCKn
-
20
-
20
ns
Notes:
• AC characteristic in CLK synchronized mode.
• C
L
is the load capacity value of pins when testing.
• Depending on the used machine clock frequency, the maximum possible baud rate can be limited by
some
parameters. These parameters are shown in “MB96600 series HARDWARE MANUAL”.
• t
CLKP1
indicates the peripheral clock 1 (CLKP1), Unit: ns
• These characteristics only guarantee the same relocate port number.
For example, the combination of SCKn and SOTn_R is not guaranteed.
*: Parameter N depends on t
SCYC
and can be calculated as follows:
• If t
SCYC
= 2
k
t
CLKP1
, then N = k, where k is an integer > 2
• If t
SCYC
= (2
k + 1)
t
CLKP1
, then N = k + 1, where k is an integer > 1
