Fig. 6.7.11 I C Clock Contorol Register - Renesas 7200 Series User Manual

APPENDIX
6.7 Control registers
2
I C Clock Control Register
b7 b6 b5 b4 b3 b2 b1 b0
2
Fig. 6.7.11 I C clock contorol register
6-36
2
I C clock control register (S2 : address 00DB
B Name
0
SCL frequency control bits
Setup value of
to
(CCR0 to CCR4)
CCR4–CCR0
4
5 SCL mode
0 : Standard clock mode
specification bit
1 : High-speed clock mode
(FAST MODE)
6 ACK bit
0 : ACK is returned.
(ACK BIT)
1 : ACK is not returned.
7 ACK clock bit
0 : No ACK clock
(ACK)
1 : ACK clock
Note: At 4000kHz in the high-speed clock mode, the duty is as below .
"0" period : "1" period = 3 : 2
In the other cases, the duty is as below.
"0" period : "1" period = 1 : 1
7220 Group User's Manual
)
16
Functions
Standard clock High speed
mode clock mode
00 to 02
Setup disabled Setup disabled
03 Setup disabled 333
04 250
Setup disabled
05 100 400 (See note)
06 83.3 166
500/CCR value 1000/CCR value
17.2 34.5
1D
16.6 33.3
1E
16.1 32.3
1F
(at φ = 4 MHz, unit : kHz)
After reset R W
R W
0
R W
0
R W
0
R W
0
Address 00DB
16