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| 型號： | MC68HC05SU3AB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | SDIP-42 |
| 文件頁數(shù)： | 20/80頁 |
| 文件大小： | 710K |
| 代理商： | MC68HC05SU3AB |
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MC68HC05SU3A
MOTOROLA
3-3
INPUT/OUTPUT PORTS
3
3.4
Programmable Current Drive
All I/O ports (except PB0 and PB1), when programmed as outputs, can source or sink a current
of 10mA for driving LEDs directly. By setting the PIL bit in the Port Option Register (at $0A),
PB5-PB7 can be programmed to a low-current mode that source or sink only a current of 2mA
when programmed as output. This allows a direct drive to low current LEDs.
Note:
Although the ports each has high current drive capability, designs should limit the total
port currents to not more than 100mA.
3.5
Programmable Pull-Up Devices
Ports B, C, and D have 20K
pull-up resistors, which can be connected or disconnected, by
setting appropriate bits in the Port Option Register (at $0A). Port pins PB0 and PB1 each has a
permanent 1.9K
pull-up resistor connected.
3.5.1
Port Option Register
PIL — PB5:PB7 current drive select
1 (set)
–
PB5-PB7 are congured to 2mA drive port.
0 (clear) –
PB5-PB7 are congured to 10mA drive port.
PDP — Port D Pull-up
1 (set)
–
The internal 20K
pull-up resistors are connected to the inputs of
Port D.
0 (clear) –
No pull-up resistor is connected to the inputs of Port D.
PCP — Port C Pull-up
1 (set)
–
The internal 20K
pull-up resistors are connected to the inputs of
Port C.
0 (clear) –
No pull-up resistor is connected to the inputs of Port C.
PBP — PB2:PB7 Pull-up
1 (set)
–
The internal 20K
pull-up resistors are connected to the inputs of
PB2-PB7.
0 (clear) –
No pull-up resistor is connected to the inputs of PB2-PB7.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Port Option Register (POPR)
$0A
PIL
PDP
PCP
PBP
0000 0000
TPG
25
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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