参数资料
型号: MC68HC05SR3FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 25/96页
文件大小: 3143K
代理商: MC68HC05SR3FB
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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