Document #: 38-08015 Rev. *J Page 52 of 99
GPIO n Direction Register [R/W]
■ GPIO 0 Direction Register 0xC022
■ GPIO 1 Direction Register 0xC028
Register Description
The GPIO n Direction register controls the direction of the GPIO
data pins (input/output). The GPIO 0 Direction register controls
GPIO15 to GPIO0 while the GPIO 1 Direction register controls
GPIO31 to GPIO16.
Direction Select (Bits [15:0])
The Direction Select field[15:0] configures the corresponding
GPIO15–0 or GPIO31–16 pins as either input or output. When
any bit of this register is set to ‘1’, the corresponding GPIO data
pin becomes an output. When any bit of this register is set to ‘0’,
the corresponding GPIO data pin becomes an input.
IDE Registers
In addition to the standard IDE PIO Port registers, there are four
registers dedicated to IDE operation. These registers are
covered in this section and summarized in Table 82.
IDE Mode Register [0xC048] [R/ W]
Register Description
The IDE Mode register allows the selection of IDE PIO Modes 0,
1, 2, 3, or 4. The default setting is zero which means IDE PIO
Mode 0.
Mode Select (Bits [2:0])
The Mode Select field sets PIO Mode 0 to 4 in IDE mode. Refer
to Table 84 on page 53 for a definition of this field.
Table 81. GPIO n Direction Register
Bit # 31/15 30/14 29/13 28/12 27/11 26/10 25/9 24/8
Field Direction Select...
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Default 0 0 0 0 0 0 0 0
Bit # 23/7 22/6 21/5 20/4 19/3 18/2 17/1 16/0
Field ...Direction Select
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Default 0 0 0 0 0 0 0 0
Table 82. IDE Registers
Register Name Address R/W
IDE Mode Register 0xC048 R/W
IDE Start Address Register 0xC04A R/W
IDE Stop Address Register 0xC04C R/W
IDE Control Register 0xC04E R/W
IDE PIO Port Registers 0xC050-0xC06F R/W
Table 83. IDE Mode Register
Bit # 15 14 13 12 11 10 9 8
Field Reserved...
Read/Write - - - - - - - -
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Field ...Reserved Mode Select
Read/Write - - - - R/W R/W R/W R/W
Default 0 0 0 0 0 0 0 0
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