參數(shù)資料
型號: MC68HC05F8B
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP56
封裝: SDIP-56
文件頁數(shù): 67/126頁
文件大?。?/td> 736K
代理商: MC68HC05F8B
MC68HC05F8
MOTOROLA
5-9
INTERRUPTS
5
Figure 5-4 Keyboard Interrupt Circuit
&
+
&
KEYE
KEYX7
KEYX4
KEYX5
KEYX6
PORT A DDR
Bit x
select
PORT A DATA
BIT x
VDD
PAx
250K
Port A bit x data line
DDRA bit x line
To CPU
KEY
x is a port A line
KEY is KEYE for PA0-PA3
and KEYX4-KEYX7 for PA4-PA7 respectively
(a) Pull-up circuit for port A lines
Keyboard
interrupt
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
Keyboard Control Register
(b) Keyboard interrupt circuit
TPG
43
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