参数资料
型号: MC68HC908JL8MFAE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
封装: PLASTIC, LQFP-32
文件页数: 40/56页
文件大小: 648K
代理商: MC68HC908JL8MFAE
MC68HC908JL8SM/D
Input/Output (I/O) Ports
MC68HC908JL8MC68HC908JK8
Input/Output (I/O) Ports
Port A
Port A is an 8-bit special function port that shares all of its pins with the
keyboard interrupt (KBI) module. Each port A pin also has a software
configurable pullup device if the corresponding port pin is configured as a
general-purpose input port pin. PTA0–PTA5 and PTA7 has direct LED drive
capability.
NOTE:
PTA0–PTA5 pins are available on 28-pin and 32-pin packages only.
PTA7 pin is available on 32-pin packages only.
Port A Data Register
PTA[7:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of each
port A pin is under the control of the corresponding bit in data direction
register A. Reset has no effect on port A data.
Data Direction
Register A
DDRA[7:0] — Data Direction Register A Bits
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
Port A Input Pullup
Enable Registers
$0000
Bit 7
65432
1
Bit 0
PTA7
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Reset:
Unaffected by reset
Additional Function:
KBI6
KBI5
KBI4
KBI3
KBI2
KBI1
KBI0
Figure 39. Port A Data Register (PTA)
$0004
Bit 7
65432
1
Bit 0
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Reset:
0
00000
00
Figure 40. Data Direction Register A (DDRA)
$000D
Bit 7
654321
Bit 0
PTA6EN PTAPUE6 PTAPUE5 PTAPUE4 PTAPUE3 PTAPUE2 PTAPUE2 PTAPUE0
Reset:
00000000
Figure 41. Port A Input Pull-up Enable Register (PTAPUE)
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For More Information On This Product,
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