參數(shù)資料
型號: PIC16CR76T-I/SO
廠商: Microchip Technology
文件頁數(shù): 20/172頁
文件大?。?/td> 0K
描述: IC PIC MCU 8KX14 28SOIC
標(biāo)準(zhǔn)包裝: 1,600
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: ROM
RAM 容量: 368 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
PIC18F2220/2320/4220/4320
DS39599G-page 114
2007 Microchip Technology Inc.
10.6
Parallel Slave Port
In addition to its function as a general I/O port, PORTD
can also operate as an 8-bit wide Parallel Slave Port
(PSP) or microprocessor port. PSP operation is con-
trolled by the 4 upper bits of the TRISE register
Setting
control
bit,
PSPMODE
(TRISE<4>), enables PSP operation, as long as the
Enhanced CCP module is not operating in dual output
or quad output PWM mode. In Slave mode, the port is
asynchronously readable and writable by the external
world.
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
the control bit, PSPMODE, enables the PORTE I/O
pins to become control inputs for the microprocessor
port. When set, port pin RE0 is the RD input, RE1 is the
WR input and RE2 is the CS (Chip Select) input. For
this functionality, the corresponding data direction bits
of the TRISE register (TRISE<2:0>) must be config-
ured as inputs (set). The A/D port configuration bits
PFCG3:PFCG0 (ADCON1<3:0>) must also be set to
‘1010’.
A write to the PSP occurs when both the CS and WR
lines are first detected low and ends when either are
detected high. The PSPIF and IBF flag bits are both set
when the write ends.
A read from the PSP occurs when both the CS and RD
lines are first detected low. The data in PORTD is read
out and the OBF bit is set. If the user writes new data
to PORTD to set OBF, the data is immediately read out;
however, the OBF bit is not set.
When either the CS or RD lines are detected high, the
PORTD pins return to the input state and the PSPIF bit is
set. User applications should wait for PSPIF to be set
before servicing the PSP; when this happens, the IBF and
OBF bits can be polled and the appropriate action taken.
The timing for the control signals in Write and Read
modes is shown in Figure 10-16 and Figure 10-17,
respectively.
FIGURE 10-15:
PORTD AND PORTE
BLOCK DIAGRAM
(PARALLEL SLAVE PORT)
Note:
The Parallel Slave Port is only available on
PIC18F4X20 devices.
Data Bus
WR LATD
RDx pin
Q
D
CK
EN
QD
EN
RD PORTD
One bit of PORTD
Set Interrupt Flag
PSPIF (PIR1<7>)
Read
Chip Select
Write
RD
CS
WR
TTL
or
WR PORTD
RD LATD
Data Latch
Note:
I/O pins have diode protection to VDD and VSS.
PORTE Pins
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