MC68HC711D3CFNE3 Freescale Semiconductor, MC68HC711D3CFNE3 Datasheet - Page 91

IC MCU 8BIT 2MHZ 44-PLCC

MC68HC711D3CFNE3

Manufacturer Part Number
MC68HC711D3CFNE3
Description
IC MCU 8BIT 2MHZ 44-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheets

Specifications of MC68HC711D3CFNE3

Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
26
Program Memory Size
4KB (4K x 8)
Program Memory Type
OTP
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-

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TCTL2 — Timer Control 2
9.2.1 Timer Control 2 Register
EDGxB and EDGxA — Input Capture Edge Control
TECHNICAL DATA
RESET:
In most cases, input capture edges are asynchronous to the internal timer counter,
which is clocked relative to the PH2 clock. 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 com-
pare, there is a similar delay between the actual compare point and when the output
pin changes state.
The control and status bits that implement the input capture functions are contained in
the PACTL, TCTL2, TMSK1, and TFLG1 registers.
To configure port A bit 3 as an input capture, clear the DDRA3 bit of the PACTL reg-
ister. Note that this bit is cleared out of reset. To enable PA3 as the fourth input cap-
ture, set the I4/O5 bit in the PACTL register. Otherwise, PA3 is configured as a fifth
output compare out of reset, with bit I4/O5 being cleared. If the DDRA3 bit is set (con-
figuring PA3 as an output), and IC4 is enabled, then writes to PA3 cause edges on the
pin to result in input captures. Writing to TI4/O5 has no effect when the TI4/O5 register
is acting as IC4.
Use the control bits of this register to program input capture functions to detect a par-
ticular edge polarity on the corresponding timer input pin. Each of the input capture
functions can be independently configured to detect rising edges only, falling edges
only, any edge (rising or falling), or to disable the input capture function. The input cap-
ture functions operate independently of each other and can capture the same TCNT
value if the input edges are detected within the same timer count cycle.
There are four pairs of these bits. Each pair is cleared to zero by reset and must be
encoded to configure the corresponding input capture edge detector circuit. IC4 func-
tions only if the I4/O5 bit in the PACTL register is set. Refer to Table 9-2 for timer con-
trol configuration.
EDG4B
Bit 7
0
EDGxB
EDG4A
0
0
1
1
Freescale Semiconductor, Inc.
6
0
Table 9-2 Timer Control Configuration
For More Information On This Product,
EDG1B
Go to: www.freescale.com
5
0
EDGxA
TIMING SYSTEM
0
1
0
1
EDG1A
4
0
Capture disabled
Capture on rising edges only
Capture on falling edges only
Capture on any edge
EDG2B
3
0
Configuration
EDG2A
2
0
EDG3B
1
0
$0021
EDG3A
Bit 0
0
9-5

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