568
CHAPTER 27 I
2
C INTERFACE (ONLY MB90485 SERIES)
27.3.3 Clock Control Register (ICCR)
This section describes the configuration and functions of the clock control register
(ICCR).
■
Clock control register (ICCR)
The diagram below shows the bit configuration of the clock control register (ICCR).
The functions of the clock control register (ICCR) are as follows.
[bit7, bit6] Unused
These bits are unused.
[bit5] EN: ENable
This bit is used to enable I
2
C interface operation.
•
When this bit is set to "0", each bit of the IBSR register and the IBCR register (except for the
BER and BEIE bits) is cleared.
•
Setting the BER bit clears this bit.
[bit4 to bit0] CS4 to CS0: Clock Period Select 4 to 0
These bits are used to set the frequency of the serial clock. The shift clock frequency fsck is
set in this register according to the following formula.
The values for m and n must be as shown in Table 27.3-1 for CS4 to CS0.
0
Operation disabled
1
Operation enabled
Address: 00008A
H
Clock control register
Read/Write
Initial value
7 6 5 4 3 2 1 0 Bit
number
-
- EN CS4
CS3
CS2 CS1
CS0 ICCR
(-) (-) (R/W)
(R/W)
(R/W) (R/W) (R/W) (R/W)
(-) (-) (0) (X) (X) (X) (X) (X)
f
s
ck =
m
×
n + 4
φ
φ
: M
a
chine clock
Summary of Contents for MB90480 Series
Page 2: ......
Page 4: ......
Page 10: ...vi ...
Page 128: ...106 CHAPTER 4 RESET ...
Page 174: ...152 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 198: ...176 CHAPTER 7 MODE SETTING ...
Page 220: ...198 CHAPTER 9 TIMEBASE TIMER ...
Page 238: ...216 CHAPTER 11 WATCH TIMER ...
Page 280: ...258 CHAPTER 12 16 BIT INPUT OUTPUT TIMER ...
Page 406: ...384 CHAPTER 17 8 10 BIT A D CONVERTER ...
Page 478: ...456 CHAPTER 20 CHIP SELECTION FACILITY ...
Page 494: ...472 CHAPTER 21 ADDRESS MATCH DETECTION FUNCTION ...
Page 498: ...476 CHAPTER 22 ROM MIRROR FUNCTION SELECTION MODULE ...
Page 526: ...504 CHAPTER 23 2M 3M BIT FLASH MEMORY ...
Page 536: ...514 CHAPTER 24 EXAMPLES OF MB90F481B MB90F482B MB90F488B MB90F489B SERIAL PROGRAMMING ...
Page 570: ...548 CHAPTER 25 PWC TIMER ONLY MB90485 SERIES ...
Page 688: ......