DEMO9S12XEP100 Freescale Semiconductor, DEMO9S12XEP100 Datasheet - Page 114

• Manufacturer Part Number: DEMO9S12XEP100
• Description: BOARD DEMO FOR MC9S12XEP100
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S12XEP100

• Contents: Board, Cables, CD
• Processor To Be Evaluated: MC9S12XEP100
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: S12
• Core Sub-architecture: S12
• Silicon Core Number: MC9S12
• Silicon Family Name: S12XE
• Rohs Compliant: Yes
• For Use With/related Products: MC9S12XEP100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. Read: Anytime. In emulation modes, read operations will return the data from the external bus, in all other modes the data source
Chapter 2 Port Integration Module (S12XEPIMV1)
2.3.7
114
Function
Address 0x0004 (PRR)
is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
DDRB
Altern.
Field
Field
Reset
7-0
7-0
PC
W
R
Port B Data Direction—
This register controls the data direction of pins 7 through 0.
The external bus function forces the I/O state to be outputs for all associated pins. In this case the data direction bits
will not change.
When operating a pin as a general purpose I/O, the associated data direction bit determines whether it is an input
or output.
1 Associated pin is configured as output.
0 Associated pin is configured as high-impedance input.
Port C general purpose input/output data—Data Register
Port C pins 7 through 0 are associated with data I/O lines DATA[15:8] respectively in expanded modes.
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.
DATA15
Port C Data Register (PORTC)
PC7
0
7
DATA14
PC6
0
6
Table 2-8. PORTC Register Field Descriptions
Table 2-7. DDRB Register Field Descriptions
MC9S12XE-Family Reference Manual , Rev. 1.23
Figure 2-5. Port C Data Register (PORTC)
DATA13
PC5
0
5
DATA12
PC4
0
4
Description
Description
DATA11
PC3
3
0
DATA10
PC2
0
2
Access: User read/write
Freescale Semiconductor
DATA9
PC1
0
1
DATA8
PC0
0
0
(1)