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參數(shù)資料
| 型號： | AN1746 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)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 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 308K |
| 代理商： | AN1746 |
Application Note
Migrating to the MC68HC705KJ1
AN1746
Ports
The KJ1 I/O pins have expanded high current capabilities that allow
them to source or sink current to a device. Depending on the current
requirements, these pins can be used to switch power to other parts of
the system, light LEDs, or switch opto-coupled triacs without external
transistors.
Table 1
shows the maximum ratings for the I/O pins.
Consult the KJ1 databook for high-side and low-side driver
characteristics and graphs.
Port A
No changes needed on port A.
Port B
The KJ1 has two bits of the port B register bonded out. These are bits 2
and 3. Change your code by mapping the K1’s port B pins to the KJ1’s
port B pins. This mapping also applies to the port B data direction
register and the port B pulldown register.
K1 PB0 maps to KJ1 PB2.
K1 PB1 maps to KJ1 PB3.
Table 1. KJ1 I/O Maximum Current Ratings
Characteristic
Symbol
Max
Unit
High source current
PA7–PA4 pins
PA3–PA0 pins
PB3–PB2 pins
I
OH
2.5
5.5
5.5
mA
High sink current
PA7–PA0 pins
PB3–PB2 pins
I
OL
10
10
mA
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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