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參數(shù)資料
| 型號(hào)： | AN1746 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Migrating from the MC68HC705K1 to the MC68HC705KJ1 |
| 中文描述： | 從MC68HC705K1遷移到MC68HC705KJ1 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 308K |
| 代理商： | AN1746 |
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Application Note
Migrating to the MC68HC705KJ1
AN1746
Clock
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
.
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-M
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.
Table 2. KJ1 Clock Options
Clock Option
Comments
Part Number
Crystal oscillator
Internal feedback resistor
con gured in MOR
MC68HC705KJ1
Crystal oscillator (32 kHz)
Do not use internal
feedback resistor
MC68HLC705KJ1
Ceramic resonator
Internal feedback resistor
con gured in MOR
MC68HC705KJ1
RC oscillator
Uses either external or
internal resistor
MC68HRC705KJ1
External clock
Direct connection of clock
source
MC68HC705KJ1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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