mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 141
mc9s12q128
Manufacturer Part Number
mc9s12q128
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12Q128.pdf
(644 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC9S12Q128
Manufacturer:
FREESCALE
Quantity:
4 000
Company:
Part Number:
mc9s12q128CFU
Manufacturer:
FREESCALE
Quantity:
5
Company:
Part Number:
mc9s12q128CPBE16
Manufacturer:
FREESCAL
Quantity:
372
Company:
Part Number:
mc9s12q128MFUE16
Manufacturer:
MOTOROLA
Quantity:
591
Part Number:
mc9s12q128MFUE16
Manufacturer:
FREESCALE
Quantity:
20 000
Company:
Part Number:
mc9s12q128VFU16
Manufacturer:
FREESCALE
Quantity:
1 831
- Current page: 141 of 644
- Download datasheet (4Mb)
4.3.2.8
Read: Anytime (provided this register is in the map).
Write: Each bit has specific write conditions. Please refer to the descriptions of each bit on the following
pages.
Port E serves as general-purpose I/O or as system and bus control signals. The PEAR register is used to
choose between the general-purpose I/O function and the alternate control functions. When an alternate
control function is selected, the associated DDRE bits are overridden.
The reset condition of this register depends on the mode of operation because bus control signals are
needed immediately after reset in some modes. In normal single-chip mode, no external bus control signals
are needed so all of port E is configured for general-purpose I/O. In normal expanded modes, only the E
clock is configured for its alternate bus control function and the other bits of port E are configured for
general-purpose I/O. As the reset vector is located in external memory, the E clock is required for this
access. R/W is only needed by the system when there are external writable resources. If the normal
expanded system needs any other bus control signals, PEAR would need to be written before any access
that needed the additional signals. In special test and emulation modes, IPIPE1, IPIPE0, E, LSTRB, and
R/W are configured out of reset as bus control signals.
This register is not in the on-chip memory map in expanded and special peripheral modes. Therefore, these
accesses will be echoed externally.
Freescale Semiconductor
Module Base + 0x000A
Starting address location affected by INITRG register setting.
Normal Expanded Wide
Emulation Expanded
Emulation Expanded
Special Single Chip
Normal Single Chip
Normal Expanded
Special Test
Peripheral
Port E Assignment Register (PEAR)
Narrow
Narrow
Reset
Wide
W
R
NOACCE
0
0
0
1
1
0
0
0
7
Figure 4-12. Port E Assignment Register (PEAR)
= Unimplemented or Reserved
0
0
0
0
0
0
0
0
0
6
PIPOE
MC9S12Q128
0
1
0
1
1
0
0
0
5
Rev 1.09
NECLK
4
0
0
0
0
0
1
0
0
Chapter 4 Multiplexed External Bus Interface (MEBIV3)
LSTRE
0
1
0
1
1
0
0
0
3
RDWE
0
1
0
1
1
0
0
0
2
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
141
Related parts for mc9s12q128
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Microcontrollers
Manufacturer:
FREESCALE [Freescale Semiconductor, Inc]
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: