MC68HC11K1CFN4 Freescale Semiconductor, MC68HC11K1CFN4 Datasheet - Page 248

• Manufacturer Part Number: MC68HC11K1CFN4
• Description: IC MCU 640 EEPROM 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11K1CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Type: ROMless
• Eeprom Size: 640 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Program Memory Size: -

Memory Expansion and Chip Selects
11.4.5 Clock Stretching
Technical Data
248
G1DG2
0
0
0
0
1
1
1
1
G1DPC
0
0
1
1
0
0
1
1
G2DPC
0
1
0
1
0
1
0
1
Chip select and bus control signals are synchronized with the external
E clock. To accommodate devices that are slower than the MCU, the
E clock can be stretched when a chip select is asserted so that it remains
high for one to three extra bus cycles. During this stretch, which can
occur only during accesses to addresses in that chip select’s address
range, the other clocks continue running normally, maintaining the
integrity of the timers and baud generators. Each chip select has two
associated bits in the chip-select clock stretch (CSCSTR) register that
set its clock stretching from zero (disabled) to three cycles.
Table 11-8. One Chip Select Driving Another
Freescale Semiconductor, Inc.
When Address is in:
or general 1 or 2 area
or general 1 or 2 area
A valid program area
A valid program area
For More Information On This Product,
Program CS Pin
or general 2 area
or general 1 area
or general 2 area
or general 1 area
A valid program
A valid program
A valid program
A valid program
A valid program
A valid program
Memory Expansion and Chip Selects
is Asserted
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A valid general 2 area
A valid general 2 area
A valid general 2 area
When Address is in:
General 2 CS Pin
or general 1 area
A valid general 2
Never asserted
Never asserted
Never asserted
Never asserted
is Asserted
A valid general 1 area
A valid general 1 area
A valid general 1 area
When Address is in:
General 1 CS Pin
Never asserted
Never asserted
Never asserted
Never asserted
Never asserted
is Asserted
M68HC11K Family
MOTOROLA