參數(shù)資料
型號: MC68HC05G3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 95/128頁
文件大?。?/td> 290K
代理商: MC68HC05G3
Page 59
Section 6: INPUT/OUTPUT PORTS
MOTOROLA
MC68HC05G3 (705G4) Specification Rev. 1.1
6.5
PORT E
Port E is an 8-bit bidirectional general-purpose port. The data direction of a port E pin is
determined by its corresponding DDRE bit.
When a bit is programmed as an output by the corresponding DDRE bit, data in the PORTE
data register becomes output data to the pin and it is returned for CPU read of PORTE
register.
When a bit is programmed as input by the corresponding DDRE bit, the pin level is read by
the CPU.
6.5.1
PORT E DATA REGISTER (PORTE)
READ:
anytime
(returns pin level if DDR set to input; returns output data latch if DDR set to
output)
WRITE:
anytime
(data stored in an internal latch; drives pin only if DDR set for output)
RESET:
becomes high impedance inputs
6.5.2
PORT E DATA DIRECTION REGISTER (DDRE)
READ:
anytime (when OPTM = 1)
WRITE:
anytime (when OPTM = 1)
RESET:
cleared to $00 (all general-purpose I/O configured for input)
DDRE
x
Port E Data Direction Register Bit
x
0 - configure I/O pin PE
x to input
1 - configure I/O pin PE
x to output
PE7
$0004
PE6
PE5
PE4
PE3
PE2
PE1
PE0
PORTE
B7
B6
B5
B4
B3
B2
B1
B0
UUUUUUUU
RESET:
DDRE7
option
map
$0004
DDRE6 DDRE5 DDRE4 DDRE3 DDRE2 DDRE1 DDRE0
DDRE
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
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