
Philips Semiconductors
PNX15xx Series
Volume 1 of 1
Chapter 25: I2C Interface
PNX15XX_SER_3
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 3 — 17 March 2006
25-18
Offset 0x04 5FE0
I2C INTERRUPT STATUS REGISTER
31:1
-
Unused
Ignore upon read. Write as zeroes.
0
R
0
INT_STATUS
Interrupt status register. It reports any pending interrupts:
1 = Interrupt i pending.
0 = Interrupt i not pending.
Offset 0x04 5FE4
I2C INTERRUPT ENABLE REGISTER
31:1
-
Unused
Ignore upon read. Write as zeroes.
0
R/W
0
INT_ENABLE
Interrupt enable register
1 = Interrupt i is enabled.
0 = Interrupt is disabled.
Offset 0x04 5FE8
I2C INTERRUPT CLEAR REGISTER
31:1
-
Unused
Ignore upon read. Write as zeroes.
0
W
0
INT_CLEAR
Interrupt clear register.
1 = Interrupt is cleared.
0 = Interrupt is not cleared.
Note: The IIC module will look at a new transaction on the I2C bus as soon as the previous interrupt has been cleared.
Therefore, software must make sure that “interrupt clear” is the last transaction that is sent to the IIC module before starting
a new transaction.
Offset 0x04 5FEC
I2C INTERRUPT SET REGISTER
31:1
-
Unused
Ignore upon read. Write as zeroes.
0
W
0
INT_SET
Interrupt set register. Allows software to set interrupts.
1 = Interrupt is set
0 = Interrupt is not set.
Offset 0x04 5FF0
Reserved
Offset 0x04 5FF4
I2C POWERDOWN REGISTER
31
R/W
0
POWER_DOWN
0 = Normal operation of peripheral. This is the reset value.
1 = Module is powerdown and module clock can be removed.
Module returns DEADABBA on all reads except for reads of the
powerdown bit. Module generates ERR ACK on all writes except for
writes to the powerdown bit.
30:0
-
Unused
Ignore upon read. Write as zeroes.
Offset 0x04 5FF8
Reserved
Offset 0x04 5FFC
I2C MODULE ID REGISTER
31:16
R
0x0105
MODULE ID
Unique 16-bit code. Module ID
15:12
R
0x0
MAJREV
Major Revision
11:8
R
0x3
MINREV
Minor Revision
7:0
R
0x00
MODULE APERTURE
SIZE
Aperture size = 4 kB*(bit_value+1), so 0 means 4 kB (the default).
Table 7: IIC Registers …Continued
Bit
Acces
s
Value
Symbol
Description