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參數(shù)資料
| 型號： | ENC424J600T-I/PT |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 106/168頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ETHERNET CTRLR W/SPI 44-TQFP |
| 視頻文件： | Fast 100 Mbps Ethernet PICtail Plus Overview |
| 標準包裝： | 1,200 |
| 控制器類型： | 以太網(wǎng)控制器（IEEE 802.3） |
| 接口： | SPI |
| 電源電壓： | 3 V ~ 3.6 V |
| 電流 - 電源： | 96mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-TQFP |
| 供應商設備封裝： | 44-TQFP（10x10） |
| 包裝： | 帶卷 (TR) |
| 配用： | AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET |
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PIC16CR7X
DS21993C-page 40
2007 Microchip Technology Inc.
4.6
Parallel Slave Port
The Parallel Slave Port (PSP) is not implemented on
the PIC16CR73 or PIC16CR76.
PORTD operates as an 8-bit wide Parallel Slave Port,
or microprocessor port, when control bit PSPMODE
(TRISE<4>) is set. In Slave mode, it is asynchronously
readable and writable by an external system using the
read control input pin RE0/RD, the write control input
pin RE1/WR, and the Chip Select control input pin RE2/
CS.
The PSP can directly interface to an 8-bit micro-
processor data bus. The external microprocessor can
read or write the PORTD latch as an 8-bit latch. Setting
bit PSPMODE enables port pin RE0/RD to be the RD
input, RE1/WR to be the WR input and RE2/CS to be
the CS (Chip Select) input. For this functionality, the
corresponding data direction bits of the TRISE register
(TRISE<2:0>) must be configured as inputs (i.e., set).
The A/D port Configuration bits PCFG3:PCFG0
(ADCON1<3:0>) must be set to configure pins
RE2:RE0 as digital I/O.
There are actually two 8-bit latches, one for data output
(external reads) and one for data input (external
writes). The firmware writes 8-bit data to the PORTD
output data latch and reads data from the PORTD input
data latch (note that they have the same address). In
this mode, the TRISD register is ignored, since the
external device is controlling the direction of data flow.
An external write to the PSP occurs when the CS and
WR lines are both detected low. Firmware can read the
actual data on the PORTD pins during this time. When
either the CS or WR lines become high (level trig-
gered), the data on the PORTD pins is latched, and the
Input Buffer Full (IBF) status flag bit (TRISE<7>) and
interrupt flag bit PSPIF (PIR1<7>) are set on the Q4
clock cycle, following the next Q2 cycle to signal the
write is complete (Figure 4-9). Firmware clears the IBF
flag by reading the latched PORTD data and clears the
PSPIF bit.
The Input Buffer Overflow (IBOV) status flag bit
(TRISE<5>) is set if an external write to the PSP occurs
while the IBF flag is set from a previous external write.
The previous PORTD data is overwritten with the new
data. IBOV is cleared by reading PORTD and clearing
IBOV.
A read from the PSP occurs when both the CS and RD
lines are detected low. The data in the PORTD output
latch is output to the PORTD pins. The Output Buffer
Full (OBF) status flag bit (TRISE<6>) is cleared imme-
diately (Figure 4-10), indicating that the PORTD latch is
being read, or has been read by the external bus. If
firmware writes new data to the output latch during this
time, it is immediately output to the PORTD pins, but
OBF will remain cleared.
When either the CS or RD pins are detected high, the
PORTD outputs are disabled, and the interrupt flag bit
PSPIF is set on the Q4 clock cycle following the next
Q2 cycle, indicating that the read is complete. OBF
remains low until firmware writes new data to PORTD.
When not in PSP mode, the IBF and OBF bits are held
clear. Flag bit IBOV remains unchanged. The PSPIF bit
must be cleared by the user in firmware; the interrupt
can be disabled by clearing the interrupt enable bit
PSPIE (PIE1<7>).
FIGURE 4-8:
PORTD AND PORTE
BLOCK DIAGRAM
(PARALLEL SLAVE PORT)
Data Bus
WR
Port
RD
RDx
Q
D
CK
EN
QD
EN
Port
pin
One bit of PORTD
Set Interrupt Flag
PSPIF (PIR1<7>)
Read
Chip Select
Write
RD
CS
WR
Note: I/O pin has protection diodes to VDD and VSS.
TTL
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