參數(shù)資料
型號: MC68HC05J1AVP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數(shù): 97/128頁
文件大?。?/td> 1279K
代理商: MC68HC05J1AVP
Technical Data
MC68HC05J1A — Rev. 3.0
70
Parallel Input/Output (I/O)
MOTOROLA
Parallel Input/Output (I/O)
Figure 7-8. Port B I/O Circuit
PBx
DATA DIRECTION
REGISTER B
BIT DDRBx
PORT B DATA
REGISTER
BIT PBx
PULLDOWN
REGISTER B
BIT PDIBx
READ $0005
WRITE $0005
WRITE $0001
READ $0001
WRITE $0011
100-
A
PULLDOWN
DEVICE
PULLDOWN DEVICES ENABLED
(MASK OPTION)
RESET
IN
TE
RNA
LD
A
TA
B
U
S
Table 7-2. Port B Pin Functions
Pulldown
Mask
Option
Control Bits
I/O Pin
Mode
Accesses
to PDRB
Accesses
to DDRB
Accesses
to PORTB
PDIBx
DDRBx
Read
Write
Read/Write
Read
Write
No
X(1)
0
Input,
hi-z
U(2)
PDIB7–PDIB0 DDRB7–DDRB0
Pin
PB7–PB0
No
X
1
Output
U
PDIB7–PDIB0 DDRB7–DDRB0 PB7–PB0 PB7–PB0
Yes
0
Input,
pulldown on
UPDIB7–PDIB0 DDRB7–DDRB0
Pin
PB7–PB0
Yes
0
1
Output,
pulldown on
UPDIB7–PDIB0 DDRB7–DDRB0 PB7–PB0 PB7–PB0
Yes
1
0
Input,
hi-z
UPDIB7–PDIB0 DDRB7–DDRB0
Pin
PB7–PB0
Yes
1
Output
U
PDIB7–PDIB0 DDRB7–DDRB0 PB7–PB0 PB7–PB0
1. X = Don’t care
2. U = Undefined
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