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Preliminary
S3C2451X RISC MICROPROCESSOR
IIC-BUS INTERFACE
18-11
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
IIC-BUS INTERFACE SPECIAL REGISTERS
MULTI-MASTER IIC-BUS CONTROL (IICCON) REGISTER
Register Address
R/W
Description
Reset
Value
IICCON0 0x54000000
R/W
IIC0-Bus
control register
0x0X
IICCON1 0x54000100
R/W
IIC1-Bus
control register
0x0X
IICCON0
IICCON1
Bit Description Initial
State
Acknowledge
generation
(1)
[7]
IIC-bus acknowledge enable bit.
0: Disable
1: Enable
In Tx mode, the IICSDA is free in the ack time.
In Rx mode, the IICSDA is L in the ack time.
0
Tx clock source
selection
[6]
Source clock of IIC-bus transmit clock prescaler selection bit.
0: IICCLK = PCLK /16
1: IICCLK = PCLK /512
0
Tx/Rx Interrupt
(5)
[5]
IIC-Bus Tx/Rx interrupt enable/disable bit.
0: Disable, 1: Enable
0
Interrupt pending
flag
(2) (3)
[4]
IIC-bus Tx/Rx interrupt pending flag. This bit cannot be written to 1.
When this bit is read as 1, the IICSCL is tied to L and the IIC is
stopped. To resume the operation, clear this bit as 0.
0: 1) No interrupt pending (when read).
2) Clear pending condition &
Resume the operation (when write).
1: 1) Interrupt is pending (when read)
2) N/A (when write)
0
Transmit clock
value
(4)
[3:0]
IIC-Bus transmit clock prescaler.
IIC-Bus transmit clock frequency is determined by this 4-bit
prescaler value, according to the following formula:
Tx clock = IICCLK/(IICCON[3:0]+1).
Undefined
NOTES:
1. Interfacing with EEPROM, the ack generation may be disabled before reading the last data in order to generate the
STOP condition in Rx mode.
2. An IIC-bus interrupt occurs 1) when a 1-byte transmits or receives operation is completed, 2) when a general call or a
slave
address match occurs, or 3) if bus arbitration fails.
3. To adjust the setup time of SDA before SCL rising edge, IICDS has to be written before clearing the IIC interrupt
pending bit.
4. IICCLK is determined by IICCON[6].
Tx clock can vary by SCL transition time.
When IICCON[6]=0, IICCON[3:0]=0x0 or 0x1 is not available.
5. If the IICCON[5]=0, IICCON[4] does not operate correctly.
So, It is recommended that you should set IICCON[5]=1, although you does not use the IIC interrupt.