PIC16C641 Datasheet

IC型号：
PIC16C641
PDF描述：
8-Bit EPROM Microcontrollers with Analog Comparators
文件大小：
661.21KB
PDF页数：
137页
芯片厂家：
MICROCHIP

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PIC16C64X & PIC16C66X

5.5

PORTE and TRISE Register

(PIC16C661 and PIC16C662 only)

Figure 5-9 shows the TRISE register, which also con-

trols the parallel slave port operation.

PORTE has three pins RE0/RD, RE1/WR, and RE2/

CS, which are individually con铿乬urable as inputs or

outputs. These pins have Schmitt Trigger input buffers.

I/O PORTE becomes control inputs for the micropro-

cessor port when bit PSPMODE (TRISE<4>) is set. In

this mode, the user must make sure that the

TRISE<2:0> bits are set (pins are con铿乬ured as digital

inputs). In this mode the input buffers are TTL.

FIGURE 5-9:

R-0

IBF

bit7

TRISE REGISTER (ADDRESS 89h)

R/W-0

IBOV

R/W-0

PSPMODE

U-0

鈥?/div>

R/W-1

TRISE2

R/W-1

TRISE1

R/W-1

TRISE0

bit0

R-0

OBF

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

bit 7:

IBF:

Input Buffer Full Status bit

1 = A word has been received and waiting to be read by the CPU

0 = No word has been received

OBF:

Output Buffer Full Status bit

1 = The output buffer still holds a previously written word

0 = The output buffer has been read

IBOV:

Input Buffer Over铿俹w Detect bit (in microprocessor mode)

1 = A write occurred when a previously input word has not been read (must be cleared in software)

0 = No over铿俹w occurred

PSPMODE:

Parallel Slave Port Mode Select bit

1 = Parallel slave port mode

0 = General purpose I/O mode

Unimplemented:

Read as '0'

TRISE2:

Direction control bit for pin RE2/CS

1 = Input

0 = Output

TRISE1:

Direction control bit for pin RE1/WR

1 = Input

0 = Output

TRISE0:

Direction control bit for pin RE0/RD

1 = Input

0 = Output

bit 6:

bit 5:

bit 4:

bit 3:

bit 2:

bit 1:

bit 0:

DS30559A-page 36

Preliminary

漏

1996 Microchip Technology Inc.

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