MC68HC11E0CFNE3 Freescale Semiconductor, MC68HC11E0CFNE3 Datasheet - Page 87

IC MCU 8BIT 3MHZ 52-PLCC

MC68HC11E0CFNE3

Manufacturer Part Number
MC68HC11E0CFNE3
Description
IC MCU 8BIT 3MHZ 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheets

Specifications of MC68HC11E0CFNE3

Core Processor
HC11
Core Size
8-Bit
Speed
3MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Type
ROMless
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
Ram Memory Size
512Byte
Cpu Speed
3MHz
No. Of Timers
1
Embedded Interface Type
SCI, SPI
Digital Ic Case Style
LCC
Rohs Compliant
Yes
Processor Series
HC11E
Core
HC11
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SCI, SPI
Maximum Clock Frequency
3 MHz
Number Of Programmable I/os
38
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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
MC68HC11E0CFNE3
Manufacturer:
FREESCALE
Quantity:
6 249
Price:
Freescale Semiconductor, Inc.
SECTION 9
TIMING SYSTEM
The M68HC11 timing system is composed of five clock divider chains. The main clock
divider chain includes a 16-bit free-running counter, which is driven by a programma-
ble prescaler. The main timer's programmable prescaler provides one of the four
clocking rates to drive the 16-bit counter. Two prescaler control bits select the prescale
rate.
The prescaler output divides the system clock by 1, 4, 8, or 16. Taps off of this main
clocking chain drive circuitry that generates the slower clocks used by the pulse accu-
mulator, the real-time interrupt (RTI), and the computer operating properly (COP)
watchdog subsystems, also described in this section. Refer to Figure 9-1.
All main timer system activities are referenced to this free-running counter. The
counter begins incrementing from $0000 as the MCU comes out of reset, and contin-
ues to the maximum count, $FFFF. At the maximum count, the counter rolls over to
$0000, sets an overflow flag, and continues to increment. As long as the MCU is run-
ning in a normal operating mode, there is no way to reset, change, or interrupt the
counting. The capture/compare subsystem features three input capture channels, four
output compare channels, and one channel that can be selected to perform either in-
put capture or output compare. Each of the three input capture functions has its own
16-bit input capture register (time capture latch) and each of the output compare func-
tions has its own 16-bit compare register. All timer functions, including the timer over-
flow and RTI have their own interrupt controls and separate interrupt vectors.
The pulse accumulator contains an 8-bit counter and edge select logic. The pulse ac-
cumulator can operate in either event counting or gated time accumulation modes.
During event counting mode, the pulse accumulator's 8-bit counter increments when
a specified edge is detected on an input signal. During gated time accumulation mode,
an internal clock source increments the 8-bit counter while an input signal has a pre-
determined logic level.
RTI is a programmable periodic interrupt circuit that permits pacing the execution of
software routines by selecting one of four interrupt rates.
15
The COP watchdog clock input (E 2
) is tapped off of the free-running counter chain.
The COP automatically times out unless it is serviced within a specific time by a pro-
gram reset sequence. If the COP is allowed to time out, a reset is generated, which
drives the RESET pin low to reset the MCU and the external system. Refer to Table
9-1 for crystal related frequencies and periods.
TIMING SYSTEM
TECHNICAL DATA
9-1
For More Information On This Product,
Go to: www.freescale.com

Related parts for MC68HC11E0CFNE3