Clock Output Permission Register (Clkr) - Fujitsu F2MC-16LX Hardware Manual

20.2 Clock Output Permission Register (CLKR)

The bits of the clock output permission register (CLKR) are used for selection of the
CKOT output permission and clock output frequency.
■ Clock Output Permission Register (CLKR)
Clock output
permission register
Address:
00058
Read/write
Initial value
[bit3] CKEN
The CKEN bit is the CKOT output permission bit.
Table 20.2-1 Functions of CKEN Bit
CKEN
0
1
[bit2 to bit0] FRQ2, FRQ1, and FRQ0
The FRQ2, FRQ1, and FRQ0 bits are used to select the clock output frequency.
Table 20.2-2 Functions of the FRQ2, FRQ1, and FRQ0 Bits
FRQ2 FRQ1 FRQ0
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
Figure 20.2-1 Clock Output Permission Register (CLKR)
bit 7 6
H
(-) (-)
(-) (-)
Normal port
CKOT output
Output clock
1
0 φ/2
2
1 φ/2
3
0 φ/2
4
1 φ/ 2
5
0 φ/ 2
6
1 φ/2
7
0 φ/ 2
8
1 φ/ 2
20.2 Clock Output Permission Register (CLKR)
5 4 3 2
CKEN FRQ2 FRQ1 FRQ0
(-) (-) (R/W) (R/W) (R/W) (R/W)
(-) (-) (0) (0)
Function
φ = 16 MHz
125
250
500
1
2
4
8
16
1 0
CLKR
(0) (0)
φ = 8 MHz φ = 4 MHz
250 500
500
1
2
4
8 16
16 32
32 64
1
2
4
8
325