Renesas 89HPES24T3G2ZBAL, User Manual

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IDT Configuration Registers
PES24T3G2 User Manual 8 - 65 February 22, 2012
Notes
IOEXPINTF - I/O Expander Interface (0x430)
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Bit
Field
Field
Name
Type
Default
Value
Description
15:0 IOEDATA RW 0x0 I/O Expander Data. Each bit in this field corresponds to an I/O
expander input/output signal. Reading this field returns the cur-
rent value of the corresponding I/O pin state of the I/O expander
number selected in the Select (SEL) field in this register (i.e., the
input values last read from the I/O expander and output values
supplied to the I/O expander).
Writes to this field are ignored unless the I/O Expander Test
Mode (IOEXTM) bit is set. When the IOEXTM bit is set, the value
for outputs supplied to the I/O expander selected by the SEL field
correspond to the value written to this field instead of the value
supplied by internal logic. Bits in this field which correspond to
inputs are always read-only, even when the IOEXTM bit is set.
23:16 Reserved RO 0x0 Reserved field.
24 RELOAD-
IOEX
RW 0x0 Reload I/O Expander Signals. Writing a one to this field results
in an I/O expander SMBus transaction that refreshes all I/O
expander input and output signal values in the IOEDATA field.
This bit always returns a zero when read.
25 IOEXTM RW 0x0 IO Expander Test Mode. Setting this bit puts the I/O expander
interface into a test mode. In this test mode, I/O expander output
signals generated by the PES24T3G2 core are ignored and val-
ues supplied to the I/O expander correspond to value written to
the IOEDATA field when the RELOADIOEX bit is set.
29:26 SELECT RW 0x0 I/O Expander Select. This field selects the I/O expander on
which fields in this register operates.
0x0 - (ioe0) I/O expander 0
0x1 - (ioe1) I/O expander 1
0x2 - (ioe2) I/O expander 2
0x3 - (ioe3) I/O expander 3
0x4 - (ioe4) I/O expander 4
others - reserved
30 Reserved RO 0x0 Reserved field.
31 DONE RW1C 0x0 I/O Expander Operation Done. This bit is set when any of the
following conditions occur.
RELOADIOEX bit in this register is written, the corresponding I/O
expander is selected by the SELECT field in this register, and the
corresponding IO expander SMBus transaction completes.
The I/O expander is in test mode (i.e., IOEXTM bit set), the IOE-
DATA field is written with the RELOADIOEX bit set, the corre-
sponding I/O expander is selected by the SELECT field in this
register, and the corresponding IO expander SMBus transaction
updating the I/O expander outputs completes.
An I/O Expander Address (IOExADDR) field is written in an
SMBus I/O Expander Address (IOEXPADRy) register, the corre-
sponding I/O expander is selected by the SELECT field in this
register, and the I/O expander initialization sequence completes.