參數(shù)資料
型號: HMS77C1001A
廠商: Hynix Semiconductor Inc.
元件分類: 數(shù)學(xué)處理器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 28/45頁
文件大小: 549K
代理商: HMS77C1001A
HMS77C1000A/HMS77C1001A
Oct. 2001 Ver. 2.0
25
Otherwise, the previous state of that pin may be read into
the CPU rather than the new state.
When in doubt, it is better to separate these instructions
with a NOP or another instruction not accessing this I/O
port.
FIGURE 10-4 EQUIVALENT CIRCUIT FOR A SINGLE I/O PIN
Name
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Power-On
Reset
RESET and
WDT Reset
TRIS
N/A
I/O control registers (TRISA, TRISB)
1111 1111
1111 1111
RA
05
H
-
-
-
-
RA3
RA2
RA1
RA0
---- xxxx
---- uuuu
RB
06
H
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
xxxx xxxx
uuuu uuuu
TABLE 10-1 SUMMARY OF PORT REGISTERS
Legend: Shaded boxes = unimplemented or unused, - = unimplemented, read as ‘0’, x = unknown, u = unchanged.
Data Bus
Data Bus
Data Bus
Data Reg.
Direction Reg.
Read
V
DD
V
SS
FIGURE 10-5 SUCCESSIVE I/O OPERATION
output RB
PC
RB7:RB0
Instruction
fetched
This example shows a write
to RB followed by a read
from RB.
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC+1
PC+2
PC+3
read RB port
no operation
no operation
Port pin
written here
Port pin
read here
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