PIC12CE674 Datasheet

IC型号：
PIC12CE674
PDF描述：
8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...
文件大小：
1264.35KB
PDF页数：
129页
芯片厂家：
Microchip

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PIC12CE67X

TABLE 5-1:

SUMMARY OF PORT REGISTERS

Value on

Power-on

Reset

--11 1111

PS1

GP1

PS0

GP0

1111 1111

0001 1xxx

11xx xxxx

Value on

all other

Resets

--11 1111

1111 1111

000q quuu

11uu uuuu

Address

85h

81h

03h

05h

Name

TRIS

OPTION

STATUS

GPIO

Bit 7

鈥?/div>

GPPU

IRP

(1)

SCL

Bit 6

鈥?/div>

INTEDG

RP1

(1)

SDA

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

GPIO Data Direction Register

T0CS

RP0

GP5

T0SE

GP4

PSA

GP3

PS2

GP2

Legend: Shaded cells not used by Port Registers, read as 鈥?鈥? 鈥?= unimplemented, read as '0',

= unknown,

= unchanged,

q = see tables in Section 9.4 for possible values.

Note 1: The IRP and RP1 bits are reserved on the PIC12CE67X, always maintain these bits clear.

5.4

5.4.1

I/O Programming Considerations

BI-DIRECTIONAL I/O PORTS

Example 5-1 shows the effect of two sequential read-

modify-write instructions on an I/O port.

Any instruction which writes, operates internally as a

read followed by a write operation. The

BCF

and

BSF

instructions, for example, read the register into the

CPU, execute the bit operation and write the result back

to the register. Caution must be used when these

instructions are applied to a port with both inputs and

outputs de铿乶ed. For example, a

BSF

operation on bit5

of GPIO will cause all eight bits of GPIO to be read into

the CPU. Then the

BSF

operation takes place on bit5

and GPIO is written to the output latches. If another bit

of GPIO is used as a bi-directional I/O pin (e.g., bit0)

and it is de铿乶ed as an input at this time, the input signal

present on the pin itself would be read into the CPU

and rewritten to the data latch of this particular pin,

overwriting the previous content. As long as the pin

stays in the input mode, no problem occurs. However,

if bit0 is switched to an output, the content of the data

latch may now be unknown.

Reading the port register, reads the values of the port

pins. Writing to the port register writes the value to the

port latch. When using read-modify-write instructions

(ex.

BCF, BSF,

etc.) on a port, the value of the port pins

is read, the desired operation is done to this value, and

this value is then written to the port latch.

EXAMPLE 5-1:

READ-MODIFY-WRITE

INSTRUCTIONS ON AN

I/O PORT

;Initial GPIO Settings

; GPIO<5:3> Inputs

; GPIO<2:0> Outputs

;

GPIO latch GPIO pins

;

---------- ----------

BCF

GPIO, 5

;--01 -ppp

--11 pppp

BCF

GPIO, 4

;--10 -ppp

--11 pppp

MOVLW 007h

;

TRIS GPIO

;--10 -ppp

--11 pppp

;

;Note that the user may have expected the pin

;values to be --00 pppp. The 2nd BCF caused

;GP5 to be latched as the pin value (High).

A pin actively outputting a Low or High should not be

driven from external devices at the same time in order

to change the level on this pin (鈥渨ired-or鈥? 鈥渨ired-and鈥?.

The resulting high output currents may damage the

chip.

FIGURE 5-2:

SUCCESSIVE I/O OPERATION

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Instruction

fetched

GP5:GP0

Port pin

written here

Instruction

executed

MOVWF GPIO

(Write to

GPIO)

Port pin

sampled here

MOVF GPIO,W

(Read

GPIO)

NOP

MOVWF GPIO

PC + 1

MOVF GPIO,W

PC + 2

NOP

PC + 3

NOP

This example shows a write to GPIO followed

by a read from GPIO.

Data setup time = (0.25 T

鈥?T

)

where: T

= instruction cycle.

= propagation delay

Therefore, at higher clock frequencies, a

write followed by a read may be problematic.

DS40181B-page 26

Preliminary

漏

1998 Microchip Technology Inc.

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