參數(shù)資料
型號(hào)： MC68HC705E6
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 38/140頁
文件大?。?/td> 788K
代理商： MC68HC705E6
Input/Output Ports
MC68HC05E6 — Rev. 1.0
Input/Output Ports
port C registers are cleared, thereby returning the port pins to normal
inputs with pull-up resistors.
NOTE:
Due to an internal clamp diode, the pins cannot be pulled higher than
V
DD
, even when configured as open-drain outputs, that is, maximum
ratings for input voltage still apply to open drain outputs.
When configured as input pins, port C bits 0–7 provide a wired-OR
keyboard interrupt facility and will generate an interrupt, provided the
keyboard interrupt enable bit (KIE) in the keyboard/timer register
(KEY/TIM) is set. When configured as inputs with keyboard interrupt
capability, the pins can also have pull-ups connected to them by
correctly configuring the DDRC and CONFC bits as outlined in
Table 5
.
The structure of the port C pins is shown diagrammatically in
Figure 9
.
Once a high to low transition is sensed on any of the port C lines
(PC0–PC7) configured as inputs and not being used by the timer, a
keyboard interrupt will be generated and the keyboard status flag will be
set, provided the interrupt mask bit of the condition code register is
cleared and KIE is set. The interrupt service routine is specified by the
contents of the memory locations $1FF2 and $1FF3. The interrupt is
cleared by writing a ‘1’ to the KIRST bit in the KEY/TIM register. The
keyboard interrupt is negative edge-and-level sensitive and will force the
processor out of STOP or WAIT mode.
Table 5 Port C I/O pin configurations
DDRC CONFC
0
0
1
1
Function
Input with pull-up
Input without pull-up
Push-pull output
Open-drain output
0
1
0
1
4-ports
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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