Chapter 2 Port Integration Module (S12XEP100PIMV1)
MC9S12XE-Family Reference Manual , Rev. 1.19
108
Freescale Semiconductor
2.3.3
Port A Data Register (PORTA)
2.3.4
Port B Data Register (PORTB)
Address 0x0000 (PRR)
Access: User read/write
(1)
1. Read: Anytime. In emulation modes, read operations will return the data from the external bus, in all other modes the data source
is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
7
6
5
4
3
2
1
0
R
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
W
Altern.
Function
ADDR15
mux
IVD15
ADDR14
mux
IVD14
ADDR13
mux
IVD13
ADDR12
mux
IVD12
ADDR11
mux
IVD11
ADDR10
mux
IVD10
ADDR9
mux
IVD9
ADDR8
mux
IVD8
Reset
0
0
0
0
0
0
0
0
Figure 2-1. Port A Data Register (PORTA)
Table 2-4. PORTA Register Field Descriptions
Field
Description
7-0
PA
Port A general purpose input/output data
—Data Register
Port A pins 7 through 0 are associated with address outputs ADDR[15:8] respectively in expanded modes. In
emulation modes the address is multiplexed with IVD[15:8].
When not used with the alternative function, these pins can be used as general purpose I/O.
If the associated data direction bits of these pins are set to 1, a read returns the value of the port register, otherwise
the buffered pin input state is read.
Address 0x0001 (PRR)
Access: User read/write
(1)
1. Read: Anytime. In emulation modes, read operations will return the data from the external bus, in all other modes the data source
is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
7
6
5
4
3
2
1
0
R
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
W
Altern.
Function
ADDR7
mux
IVD7
ADDR6
mux
IVD6
ADDR5
mux
IVD5
ADDR4
mux
IVD4
ADDR3
mux
IVD3
ADDR2
mux
IVD2
ADDR1
mux
IVD1
ADDR0
mux
IVD0
or
UDS
Reset
0
0
0
0
0
0
0
0
Figure 2-2. Port B Data Register (PORTB)
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages