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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)： | 27/45頁 |
| 文件大?。?/td> | 549K |
| 代理商： | HMS77C1001A |
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HMS77C1000A/HMS77C1001A
24
Oct. 2001 Ver. 2.0
10. I/O PORTS
The HMS77C100XA has a 4-bit I/O port(RA) and a 8-bit
I/O port(RB).
All pin have data(RA,RB) and direction(TRISA,TRISB)
registers which can assign these ports as output or input.
A “0” in the port direction registers configure the corre-
sponding port pin as output. Conversely, write “1” to the
corresponding bit to specify it as input pin (Hi-Z state).
For example, to use the even numbered bit of RB as output
ports and the odd numbered bits as input ports, write “55
H
”
to TRISB register during initial setting as shown in Figure
10-1.
All the port direction registers in the HMS77C100XA have
“1” written to them by reset function. This causes all port
as input.
10.1 Port RA
RA is a 4-bit I/O register. Each I/O pin can independently
used as an input or an output through the port direction reg-
ister, TRISA. A “0” in the TRISA register configure the
corresponding port pin as output. Conversely, write “1”to
the corresponding bit to specify it as input pin.
Bits 7-4 are unimplemented and read as '0's.
10.2 Port RB
RB is an 8-bit I/O register. Each I/O pin can independently
used as an input or an output through the port direction reg-
ister, TRISB. A “0” in the TRISB register configure the
corresponding port pin as output. Conversely, write “1”to
the corresponding bit to specify it as input pin.
Note:
A read of the ports reads the pins, not the output
data latches. That is, if an output driver on a pin is
enabled and driven high, but the external system is
holding it low, a read of the port will indicate that the
pin is low.
10.3 I/O Interfacing
The equivalent circuit for an I/O port pin is shown in Fig-
ure 10-4. All ports may be used for both input and output
operation.
For input operations these ports are non-latching. Any in-
put must be present until read by an input instruction. The
outputs are latched and remain unchanged until the output
latch is rewritten. To use a port pin as output, the corre-
sponding direction control bit (in TRISA, TRISB) must be
cleared (= 0). For use as an input, the corresponding TRIS
bit must be set. Any I/O pin can be programmed individu-
ally as input or output..
10.4 I/O Successive Operations
The actual write to an I/O port happens at the end of an in-
struction cycle, whereas for reading, the data must be valid
at the beginning of the instruction cycle (Figure 10-5).
Therefore, care must be exercised if a write followed by a
read operation is carried out on the same I/O port.
The sequence of instructions should allow the pin voltage
to stabilize (load dependent) before the next instruction,
which causes that file to be read into the CPU, is executed.
FIGURE 10-1 EXAMPLE OF PORT I/O ASSIGNMENT
FIGURE 10-2 RA PORT REGISTERS
0
PORT RB
7
1
6
0
5
1
4
0
3
1
2
0
1
1
0
OUT
IN
OUT
IN
OUT
IN
OUT
IN
Write “55
H
” to port RB direction register
TRISB
RA
RA3
3
RA2
2
RA1
1
RA0
0
RA Data Register
RA Direction Register
TRISA
ADDRESS : 05
H
RESET VALUE : Undefined
ADDRESS : N/A
RESET VALUE : 0F
H
FIGURE 10-3 RB PORT REGISTERS
RB
RB7
7
RB6
6
RB5
5
RB4
4
RB Data Register
RB Direction Register
TRISB
ADDRESS : 06
H
RESET VALUE : Undefined
3
2
1
ADDRESS : N/A
RESET VALUE : FF
H
RB3
RB2
RB1
RB0
0
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