MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 52
MB90F654A
Manufacturer Part Number
MB90F654A
Description
16-bit Proprietary Microcontroller
Manufacturer
FUJITSU [Fujitsu Component Limited.]
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52
MB90650A Series
8. Clock Output Control Register
(1) Register Configuration
Clock output control register outputs the divided machine clock.
Clock control register (CLKR)
bit 3: Clock output enable bit (CKEN)
bit 2 to bit 0: Clock output frequency select bit (FRQ2 to FRQ0)
FRQ2
0
0
0
0
1
1
1
1
MODE
0
1
FRQ1
0
0
1
1
0
0
1
1
Address : 00003E
R/W
—
Operate as a standard port.
Operate as the clock output.
: Readable and writable
: Unused
FRQ0
0
1
0
1
0
1
0
1
H
bit 7
Output clock
—
/2
/2
/2
/2
/2
/2
/2
/2
bit 6
—
1
2
3
4
5
6
7
8
bit 5
—
Operation
bit 4
—
= 16 MHz
125 ns
250 ns
500 ns
16 s
1 s
2 s
4 s
8 s
CKEN FRQ2 FRQ1 FRQ0
R/W
bit 3
R/W
bit 2
= 8 MHz
250 ns
500 ns
16 s
32 s
R/W
bit 1
1 s
2 s
4 s
8 s
R/W
bit 0
= 4 MHz
500 ns
16 s
32 s
64 s
1 s
2 s
4 s
8 s
Initial value
- - - - 0 0 0 0
B
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