MC68HC11K0CFUE4 Freescale Semiconductor, MC68HC11K0CFUE4 Datasheet - Page 190

• Manufacturer Part Number: MC68HC11K0CFUE4
• Description: MCU 8-BIT 768 RAM 4MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11K0CFUE4

• 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
• 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: 80-QFP
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 37
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

Timing System
9.4.4 Port A Data Direction Register
Technical Data
190
Address: $0001
PR[1:0] — Timer Prescaler Select Bits
DDA3 — Data Direction Control for Port A, Bit 3
Reset:
Read:
Write:
These bits determine the main timer prescale divisor, as shown in
Table
number to produce the clock which drives the free-running counter.
Refer to
In normal modes, PR[1:0] can be written only once, and the write must
be within 64 cycles after reset.
Freescale Semiconductor, Inc.
For More Information On This Product,
0 = PA3 configured as an input
1 = PA3 configured as an output
DDA7
Figure 9-6. Port A Data Direction Register (DDRA)
Bit 7
9-2. The system bus (E clock) frequency is divided by this
0
Table 9-1
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DDA6
Timing System
6
0
PR[1:0]
for specific timing values.
Table 9-2. Timer Prescale
0 0
0 1
1 0
1 1
DDA5
5
0
DDA4
4
0
DDA3
3
0
Prescaler
16
1
4
8
DDA2
2
0
M68HC11K Family
DDA1
1
0
MOTOROLA
DDA0
Bit 0
0