MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 95

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

DDRK — Port K Data Direction Register
MC68HC912DT128A — Rev 4.0
MOTOROLA
RESET:
DDK7
Bit 7
0
6
0
0
When inputs, these pins can be selected to be high impedance or pulled
up.
ECS — Emulation Chip Select of selected program space
PIX[2:0] — The content of the PPAGE register emulated externally.
I
Read and write: anytime.
This register determines the primary direction for each port K pin
configured as general-purpose I/O.
This register is not in the map in peripheral or expanded modes while the
EMK control bit is set.
When this signal is active low it indicates that the program space is
accessed. This also applies to test mode program space. An access
is made if address is at the program space window and either the
Flash or external memory is accessed. The ECS timing is E clock high
and can be stretched when accessing external memory depending on
the EXTR0 and EXTR1 bits in the MISC register. The ECS signal is
only active when the EMK bit is set.
This content indicates which Flash module register space is in the
memory map and which 16K byte Flash memory is in the program
space. In special mode and with ROMTST bit set, the content of the
Page Index register indicates which 32K byte Flash array is in the test
program space.
0 = Associated pin is a high-impedance input.
1 = Associated pin is an output.
5
0
0
Resource Mapping
4
0
0
Flash EEPROM mapping through internal Memory Expansion
DDK3
3
0
DDK2
2
0
DDK1
1
0
DDK0
Resource Mapping
Bit 0
0
Technical Data
$00FD
95