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| 型號： | MC68HC05SR3B |
| 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)： | 22/96頁 |
| 文件大?。?/td> | 3045K |
| 代理商： | MC68HC05SR3B |
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MC68HC05SR3
Freescale
3-3
INPUT/OUTPUT PORTS
3
3.4
PD6 — IRQ2
The port pin PD6 is configured as IRQ2 by setting the IRQ2E bit in the MCR. The external interrupt
IRQ2 behaves similar to IRQ except it is edge-triggered only.
See Section 5.2.2.2 for details on the external interrupt IRQ2.
3.5
Programmable Current Drive
All I/O ports, 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.
Figure 3-2 Typical IOL vs VOL @VDD=5V
13
12
11
10
9
8
7
6
5
4
3
2
1
0
012
345
All ports
PB5-PB7 in low current mode
worst case
best case
typical
worst case
best case
VOL (volts)
I OL
(mA)
TPG
27
05SR3.Book Page 3 Thursday, August 4, 2005 1:08 PM
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