DEMO9S12XEP100 Freescale Semiconductor, DEMO9S12XEP100 Datasheet - Page 118

• 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
1. Read:Anytime in single-chip modes.
Chapter 2 Port Integration Module (S12XEPIMV1)
2.3.12
2.3.13
118
Address 0x0009 (PRR)
Address 0x000C (PRR)
is depending on the data direction value.
Write: Anytime. In emulation modes, write operations will also be directed to the external bus.
Write:Anytime, except BKPUE which is writable in Special Test Mode only.
DDRE
Field
Reset
Reset
7-2
1-0
W
W
R
R
Port E Data Direction—
This register controls the data direction of pins 7 through 2.
The external bus function controls the data direction for the 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.
Reserved—
Port E bit 1 (associated with IRQ) and bit 0 (associated with XIRQ) cannot be configured as outputs. Port E, bits 1
and 0, can be read regardless of whether the alternate interrupt function is enabled.
DDRE7
PUPKE
Port E Data Direction Register (DDRE)
S12X_EBI ports, BKGD pin Pull-up Control Register (PUCR)
0
1
7
7
Figure 2-11. S12X_EBI ports, BKGD pin Pull-up Control Register (PUCR)
= Unimplemented or Reserved
= Unimplemented or Reserved
DDRE6
BKPUE
0
1
6
6
Figure 2-10. Port E Data Direction Register (DDRE)
Table 2-13. DDRE Register Field Descriptions
MC9S12XE-Family Reference Manual , Rev. 1.23
DDRE5
0
0
0
5
5
DDRE4
PUPEE
0
1
4
4
Description
DDRE3
PUPDE
3
0
3
0
DDRE2
PUPCE
0
0
2
2
Access: User read/write
Access: User read/write
Freescale Semiconductor
PUPBE
0
0
0
1
1
PUPAE
0
0
0
0
0
(1)
(1)