MC68HC11E1CFNE3 Freescale Semiconductor, MC68HC11E1CFNE3 Datasheet - Page 129

IC MCU 8BIT 3MHZ 52-PLCC

MC68HC11E1CFNE3

Manufacturer Part Number
MC68HC11E1CFNE3
Description
IC MCU 8BIT 3MHZ 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheets

Specifications of MC68HC11E1CFNE3

Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Type
ROMless
Eeprom Size
512 x 8
Ram Size
512 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
52-PLCC
Controller Family/series
68HC11
No. Of I/o's
38
Eeprom Memory Size
512Byte
Ram Memory Size
512Byte
Cpu Speed
3MHz
No. Of Timers
1
Embedded Interface Type
SCI, SPI
Rohs Compliant
Yes
Processor Series
HC11E
Core
HC11
Data Bus Width
8 bit
Program Memory Size
512 B
Data Ram Size
512 B
Interface Type
SCI, SPI
Maximum Clock Frequency
3 MHz
Number Of Programmable I/os
22
Number Of Timers
8
Operating Supply Voltage
3 V to 5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
0 C
On-chip Adc
8 bit, 8 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Size
-
Lead Free Status / Rohs Status
 Details

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9.2 Timer Structure
Figure 9-2
for timer functions and for general-purpose I/O. For pins PA3, PA2, PA1, and PA0, this block contains
both the edge-detection logic and the control logic that enables the selection of which edge triggers an
input capture. The digital level on PA[3:0] can be read at any time (read PORTA register), even if the pin
is being used for the input capture function. Pins PA[6:3] are used for either general-purpose I/O, or as
output compare pins. When one of these pins is being used for an output compare function, it cannot be
written directly as if it were a general-purpose output. Each of the output compare functions (OC[5:2]) is
related to one of the port A output pins. Output compare one (OC1) has extra control logic, allowing it
optional control of any combination of the PA[7:3] pins. The PA7 pin can be used as a general-purpose
I/O pin, as an input to the pulse accumulator, or as an OC1 output pin.
9.3 Input Capture
The input capture function records the time an external event occurs by latching the value of the
free-running counter when a selected edge is detected at the associated timer input pin. Software can
store latched values and use them to compute the periodicity and duration of events. For example, by
storing the times of successive edges of an incoming signal, software can determine the period and pulse
width of a signal. To measure period, two successive edges of the same polarity are captured. To
measure pulse width, two alternate polarity edges are captured.
In most cases, input capture edges are asynchronous to the internal timer counter, which is clocked
relative to an internal clock (PH2). These asynchronous capture requests are synchronized to PH2 so that
the latching occurs on the opposite half cycle of PH2 from when the timer counter is being incremented.
This synchronization process introduces a delay from when the edge occurs to when the counter value is
detected. Because these delays offset each other when the time between two edges is being measured,
the delay can be ignored. When an input capture is being used with an output compare, there is a similar
delay between the actual compare point and when the output pin changes state.
Freescale Semiconductor
shows the capture/compare system block diagram. The port A pin control block includes logic
Control Bits
overflow —
overflow —
overflow —
overflow —
1 count —
1 count —
1 count —
1 count —
PR1, PR0
0 0
0 1
1 0
1 1
65.536 ms
262.14 ms
524.29 ms
4.0 MHz
1.0 MHz
1000 ns
1000 ns
16.0 µs
1.049 s
4.0 µs
8.0 µs
M68HC11E Family Data Sheet, Rev. 5.1
Table 9-1. Timer Summary
32.768 ms
131.07 ms
262.14 ms
524.29 ms
8.0 MHz
2.0 MHz
500 ns
500 ns
2.0 µs
4.0 µs
8.0 µs
Main Timer Count Rates
XTAL Frequencies
21.845 ms
87.381 ms
174.76 ms
349.52 ms
12.0 MHz
1.333 µs
2.667 µs
5.333 µs
3.0 MHz
333 ns
333 ns
Other Rates
(E/2
(E/2
(E/2
(E/2
(E/16)
(1/E)
(E/1)
(E/4)
(E/8)
(E)
16
18
19
20
)
)
)
)
Timer Structure
129

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