参数资料
型号: MC68HC05F4CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 67/130页
文件大小: 2089K
代理商: MC68HC05F4CP
MC68HC05F4
MOTOROLA
4-3
PARALLEL INPUT/OUTPUT PORTS
4
4.2.1.1
Key control register
This register contains two bits which are used to control the keyboard interrupt facility. The
keyboard interrupt and ag setting is enabled by setting the keyboard interrupt enable bit.
KF — Keyboard interrupt status ag
1 (set)
A high to low transition has occurred on one of the port pins.
0 (clear) –
No high to low transition has occurred on any of the port pins.
This bit is set when a high to low transition is detected on any of the port A pins and if KIE equals
one. The KF ag is cleared by accessing the port A register.
Figure 4-1 Structure of port with keyboard interrupt
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Key control register (KCR)
$0010
KF
KIE
000000
0000 0000
KIE
Bit 6, $10
DDR0
Keyboard
interrupt ag and
External pin PA0
DDR01
External pin PA1
DDR7
External pin PA7
request signal
TPG
37
05F4Book Page 3 Tuesday, August 5, 1997 1:10 pm
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