Samsung YP-P10 User Manual download pdf (Page 488)

100

101

S3C2440A RISC MICROPROCESSOR IIC-BUS INTERFACE

20-11

IIC-BUS INTERFACE SPECIAL REGISTERS

MULTI-MASTER IIC-BUS CONTROL (IICCON) REGISTER

IICCON 0x54000000 R/W IIC-Bus control register 0x0X

IICCON 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.

Tx clock source selection [6] Source clock of IIC-bus transmit clock prescaler

selection bit.

0: IICCLK = fPCLK /16

1: IICCLK = fPCLK /512

Tx/Rx Interrupt

(5)

[5] IIC-Bus Tx/Rx interrupt enable/disable bit.

0: Disable, 1: Enable

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)

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 receive 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.

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Samsung YP-P10 User Manual Page 488

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