參數(shù)資料
型號(hào): MC68HC05JB3DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 96/148頁
文件大?。?/td> 1600K
代理商: MC68HC05JB3DW
November 5, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05JB3
INPUT/OUTPUT PORTS
MOTOROLA
REV 1
7-5
Figure 7-1. PB1 Slow Falling-edge Output
7.3
PORT-C
Port-C is a 4-bit bi-directional port. The Port-C data register is at $0002 and the
data direction register (DDRC) is at $0006. Reset does not affect the data regis-
ters, but clears the data direction registers, thereby returning the port pins to
inputs. Writing a ‘one’ to a DDR bit sets the corresponding port bit to output mode.
All Port-C pins have programmable pull-down resistors, and are only available on
the 28-pin version of the device.
PC0 is also used as the 16-timer OCMP output pin.
The table below summarizes the pin congurations for Port-A.
7.3.1 Port-C Data Register
7.3.2 Port-C Data Direction Register
PDRCx
DDRCx
Pin Configuration
0
Input with pull-down
0
1
Output Push-Pull
1
0
Input
1
Output Push-Pull
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PORTC
R
PC3
PC2
PC1
PC0
$0002
W
reset:
00000000
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
DDRC
R
OCMPO
VROFF
DDRC3
DDRC2
DDRC1
DDRC0
$0006
W
reset:
00000000
50pF
5.0V
165ns
330ns
2.2V
Output Driver
0V
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