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PDF AN1746 Data sheet ( Hoja de datos )
| Número de pieza | AN1746 | |
| Descripción | Migrating from the MC68HC705K1 to the MC68HC705KJ1 | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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Freescale Semiconductor, Inc.
Freescale Semiconductor
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by AN1746/D
AN1746
Migrating from the MC68HC705K1 to the MC68HC705KJ1
By Mark Glenewinkel
Field Applications Engineering
Consumer Systems Group
Austin, Texas
Introduction
Freescale provides two different parts to migrate your current
MC68HC705K1 (K1) application easily. Depending on your design,
system enhancements, and cost, the MC68HC705KJ1 (KJ1) and the
MC68HC805K3 (K3) provide two different migration paths.
The major differences between the KJ1 and the K3 are:
• Price
• Pinout compatibility
The KJ1 is not pin for pin the same as the K1, but it is roughly 70% the
cost of the K1. Although the K3 is pin for pin the same as the K1, it is
roughly 90% the cost of the K1.
This application note illustrates the differences between the K1 and the
KJ1. Using the KJ1’s additional features can further enhance your
system design. Consult the K1 and KJ1 databooks for detailed design
reference. See References/Additional Reading in this application
note.
© Freescale Semiconductor, Inc., 2004. All rights reserved.
For More Information On This Product,
Go to: www.freescale.com
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Freescale Semiconductor, Inc.
Application Note
Migrating to the MC68HC705KJ1
OSC1
OSC2
INTERNAL
OSCILLATOR
DIVIDE
BY 2
15-STAGE
MULTIFUNCTION
TIMER SYSTEM
RESET
IRQ/VPP
WATCHDOG AND
ILLEGAL ADDRESS
DETECT
CPU CONTROL
ALU
68HC05 CPU
CPU REGISTERS
ACCUMULATOR
INDEX REGISTER
0 0 0 0 0 0 0 0 1 1 STK PTR
PROGRAM COUNTER
CONDITION CODE
REGISTER
111H I NZC
STATIC RAM (SRAM) – 64 BYTES
USER EPROM – 1240 BYTES
MASK OPTION REGISTER (EPROM)
PB3(1)
PB2(1)
PA7
PA6
PA5
PA4
PA3(1) (2)
PA2(1) (2)
PA1(1) (2)
PA0(1) (2)
10-mA sink capability on all I/O pins
NOTES:
1. 5.5-mA source capability
2. External interrupt capability
Figure 4. MC68HC705KJ1 Block Diagram
AN1746
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Clock
AN1746
Freescale Semiconductor, Inc.
Application Note
Migrating to the MC68HC705KJ1
The KJ1 has different clock circuitry than the K1. The main difference is
the RC clock option. The available clocking options on the KJ1 are listed
in Table 2.
Table 2. KJ1 Clock Options
Clock Option
Crystal oscillator
Crystal oscillator (32 kHz)
Ceramic resonator
RC oscillator
External clock
Comments
Internal feedback resistor
con gured in MOR
Do not use internal
feedback resistor
Internal feedback resistor
con gured in MOR
Uses either external or
internal resistor
Direct connection of clock
source
Part Number
MC68HC705KJ1
MC68HLC705KJ1
MC68HC705KJ1
MC68HRC705KJ1
MC68HC705KJ1
If you are using a crystal or ceramic resonator and want to use the
internal feedback resistor, the OSCRES bit in the mask option register
(MOR) must be set to 1. This enables the 2-MΩ feedback resistor. The
KJ1 has the option of using a 32-kHz crystal. Consult the KJ1 databook
about how to connect a 32-kHz crystal to the KJ1 properly.
The RC option on the KJ1 is quite different from the K1. The RC
oscillator has two options:
• For more accurate clocks, use an external resistor between the
OSC1 and OSC2 pins. Do not turn on the internal feedback
resistor. Make sure the OSCRES bit in the MOR is 0.
• For maximum cost reduction, the RC oscillator can utilize the
internal resistor and allow the chip to be driven with no external
components. This is also the least accurate way to clock the chip.
To use this option, make sure that the OSCRES bit in the MOR
is 1.
Like the K1, the KJ1 can be driven by an external clocking source also.
For More Information On This Product,
Go to: www.freescale.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AN1746.PDF ] | |
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