MB95310L/370L Series
Document Number: 002-07519 Rev. *A
Page 50 of 80
18.4.2
Source Clock/Machine Clock
(V
CC
= 3.0 V
10%, V
SS
= 0.0 V, T
A
=
40
C to
85
C)
*1: This is the clock before it is divided according to the division ratio set by the machine clock divide ratio select bits (SYCC:DIV1
and DIV0). This source clock is divided to become a machine clock according to the division ratio set by the machine clock divide
ratio select bits (SYCC:DIV1 and DIV0). In addition, a source clock can be selected from the following.
• Main clock divided by 2
• PLL multiplication of main clock (select from 2, 2.5, 4 multiplication)
• Main CR clock divided by 2
• Subclock divided by 2
• Sub-CR clock divided by 2
(Continued)
Parameter
Symbol
Pin
name
Value
Unit
Remarks
Min
Typ
Max
Source clock cy-
cle time*
1
t
SCLK
—
61.5
—
2000
ns
When the main oscillation clock is used
Min: F
CH
= 8.125 MHz, multiplied by the PLL multiplier of 2
Max: F
CH
= 1 MHz, divided by 2
80
—
1000
ns
When the main CR clock is used
Min: F
CRH
= 12.5 MHz
Max: F
CRH
= 1 MHz
—
61
—
µs
When the sub-oscillation clock is used
F
CL
= 32.768 kHz, divided by 2
—
20
—
µs
When the sub-CR clock is used
F
CRL
= 100 kHz, divided by 2
Source clock fre-
quency
F
SP
—
0.50
—
16.25
MHz
When the main oscillation clock is used
1
—
12.5
MHz
When the main CR clock is used
F
SPL
—
16.384
—
kHz
When the sub-oscillation clock is used
—
50
—
kHz
When the sub-CR clock is used
F
CRL
= 100 kHz, divided by 2
Machine clock cy-
cle time*
2
(minimum instruc-
tion execution
time)
t
MCLK
—
61.5
—
32000
ns
When the main oscillation clock is used
Min: F
SP
= 16.25 MHz, no division
Max: F
SP
= 0.5 MHz, divided by 16
80
—
16000
ns
When the main CR clock is used
Min: F
SP
= 12.5 MHz
Max: F
SP
= 1 MHz, divided by 16
61
—
976.5
µs
When the sub-oscillation clock is used
Min: F
SPL
= 16.393 kHz, no division
Max: F
SPL
= 16.393 kHz, divided by 16
20
—
320
µs
When the sub-CR clock is used
Min: F
SPL
= 50 kHz, no division
Max: F
SPL
= 50 kHz, divided by 16
Machine clock fre-
quency
F
MP
—
0.031
—
16.25
MHz
When the main oscillation clock is used
0.0625
—
12.5
MHz
When the main CR clock is used
F
MPL
1.024
—
16.384
kHz
When the sub-oscillation clock is used
3.125
—
50
kHz
When the sub-CR clock is used
F
CRL
= 100 kHz