收藏本站
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
(Register 10-1).
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
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
PIC24F16KA102-I/SO IC PIC MCU FLASH 16K 28-SOIC
PIC18F45K20-I/PT IC PIC MCU FLASH 16KX16 44TQFP
PIC16CR77-I/PT IC PIC MCU 8KX14 44TQFP
PIC16F884-I/ML IC PIC MCU FLASH 4KX14 44QFN
PIC16CR77-I/P IC PIC MCU 8KX14 40DIP
PIC18F45K20-I/MV MCU 32KB FLASH 1536B RAM 40-UQFN
PIC16CR76T-I/SS IC PIC MCU 8KX14 28SSOP
PIC18F13K50-I/P IC PIC MCU FLASH 4KX16 20-PDIP
相关代理商/技术参数
PIC16CR77T-I/PT 功能描述:IC PIC MCU 8KX14 44TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:PIC® 16C 产品培训模块:Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio 标准包装:42 系列:PIC® 16C 核心处理器:PIC 芯体尺寸:8-位 速度:20MHz 连通性:- 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:13 程序存储器容量:3.5KB（2K x 14） 程序存储器类型:OTP EEPROM 大小:- RAM 容量:128 x 8 电压 - 电源 (Vcc/Vdd):4 V ~ 5.5 V 数据转换器:A/D 4x8b 振荡器型:外部 工作温度:-40°C ~ 85°C 封装/外壳:18-SOIC（0.295"，7.50mm 宽） 包装:管件 配用:XLT18SO-1-ND - SOCKET TRANSITION 18SOIC 300MILISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING309-1011-ND - ADAPTER 18-SOIC TO 18-DIP309-1010-ND - ADAPTER 18-SOIC TO 18-DIPAC164010-ND - MODULE SKT PROMATEII DIP/SOIC
PIC16CR83T-04/SO023 制造商:Microchip Technology Inc 功能描述:
PIC16F 制造商:Microchip Technology Inc 功能描述:Microchip PIC16F677-I/P Microcontroller
PIC16F1454-E/ML 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 16QFN
PIC16F1454-E/P 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 14PDIP
PIC16F1454-E/SL 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 14SOIC
PIC16F1454-E/ST 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 14TSSOP 制造商:Microchip Technology Inc 功能描述:8-bit Microcontrollers - MCU 7KB Flsh 512b RAM 48MHz Int Osc 12 I/0
PIC16F1454-I/ML 功能描述:8位微控制器 -MCU 7 KB Flash 512 bytes RAM 48 MHz Int Osc RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT