參數(shù)資料
型號(hào)： MC68HC05E16CFU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM
中文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁(yè)數(shù)： 25/96頁(yè)
文件大?。?/td> 3045K
代理商： MC68HC05E16CFU
MC68HC05SR3
Freescale
3-5
INPUT/OUTPUT PORTS
3
3.6
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).
3.6.1
Port Option Register
PIL — PB5:PB7 current drive select
1 (set)
–
PB5-PB7 are configured to 2mA drive port.
0 (clear) –
PB5-PB7 are configured 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.
Figure 3-5 Typical IOL vs VOL @VDD=3V
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
PB1
PB0 0000 0000
0
123
VOH (volts)
0
–1
–2
–3
–4
–5
I OH
(mA)
PB5-PB7 in low current mode
worst case
typical
best case
typical
best case
worst case
All ports
TPG
29
05SR3.Book Page 5 Thursday, August 4, 2005 1:08 PM
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