Motorola ColdFire MCF5281 - Manual (Page 510)

General Purpose I/O Module
26-10 Freescale Semiconductor
26.3.2 Register Descriptions
26.3.2.1 Port Output Data Registers (PORTn)
The PORTn registers store the data to be driven on the corresponding port n pins when the pins are
configured for digital output.
Most PORTn registers have a full 8-bit implementation, as shown in Figure 26-3 . The remaining PORTn
registers use fewer than eight bits. Their bit definitions are shown in Figure 26-4 , Figure 26-5 , and
Figure 26-6 .
At reset, all bits in the PORTn registers are set.
Reading a PORTn register returns the current values in the register, not the port n pin values.
PORTn bits can be set by setting the PORTn register, or by setting the corresponding bits in the
PORTnP/SETn register. They can be cleared by clearing the PORTn register, or by clearing the
corresponding bits in the CLRn register.
7 6 5 4 3 2 1 0
Field PORTn7 PORTn6 PORTn5 PORTn4 PORTn3 PORTn2 PORTn1 PORTn0
Reset 1111_1111
R/W: R/W
Address IPSBAR + 0x10_0000 (PORTA), 0x10_0001 (PORTB), 0x10_0002 (PORTC), 0x10_0003 (PORTD),
0x10_0004 (PORTE), 0x10_0005 (PORTF), 0x10_0006 (PORTG), 0x10_0007 (PORTH),
0x10_0008 (PORTJ), 0x10_0009 (PORTDD), 0x10_000A (PORTEH), 0x10_000B (PORTEL)
Figure 26-3. Port Output Data Registers (8-bit)
7 6 5 4 3 2 1 0
Field — PORTn6 PORTn5 PORTn4 PORTn3 PORTn2 PORTn1 PORTn0
Reset 0011_1111
R/W: R R/W
Address IPSBAR + 0x10_000D (PORTQS)
Figure 26-4. Port Output Data Register (7-bit)
7 6 5 4 3 2 1 0
Field — PORTn5 PORTn4 PORTn3 PORTn2 PORTn1 PORTn0
Reset 0011_1111
R/W: R R/W
Address IPSBAR + 0x10_000C (PORTAS), 0x10_000E (PORTSD)
Figure 26-5. Port Output Data Registers (6-bit)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3