參數(shù)資料
型號(hào)： PIC18F8720-I/PT
廠商： Microchip Technology
文件頁(yè)數(shù)： 137/165頁(yè)
文件大?。?/td> 0K
描述： IC MCU FLASH 64KX16 EE 80TQFP
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 119
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 25MHz
連通性： EBI/EMI，I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，LVD，POR，PWM，WDT
輸入/輸出數(shù)： 68
程序存儲(chǔ)器容量： 128KB（64K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 3.75K x 8
電壓 - 電源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 80-TQFP
包裝： 托盤(pán)
配用： XLT80PT3-ND - SOCKET TRAN ICE 80MQFP/TQFP
AC164320-ND - MODULE SKT MPLAB PM3 80TQFP
AC174011-ND - MODULE SKT PROMATEII 80TQFP
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2004 Microchip Technology Inc.
DS39609B-page 71
PIC18F6520/8520/6620/8620/6720/8720
6.0
EXTERNAL MEMORY
INTERFACE
The External Memory Interface is a feature of the
PIC18F8X20 devices that allows the controller to
access external memory devices (such as Flash,
EPROM, SRAM, etc.) as program or data memory.
The physical implementation of the interface uses 27
pins. These pins are reserved for external address/data
bus functions; they are multiplexed with I/O port pins on
four ports. Three I/O ports are multiplexed with the
address/data bus, while the fourth port is multiplexed
with the bus control signals. The I/O port functions are
enabled when the EBDIS bit in the MEMCON register
is set (see Register 6-1). A list of the multiplexed pins
and their functions is provided in Table 6-1.
As implemented in the PIC18F8X20 devices, the
interface operates in a similar manner to the external
memory interface introduced on PIC18C601/801
microcontrollers. The most notable difference is that
the interface on PIC18F8X20 devices only operates in
16-bit modes. The 8-bit mode is not supported.
For a more complete discussion of the operating modes
that use the external memory interface, refer to
6.1
Program Memory Modes and the
External Memory Interface
As previously noted, PIC18F8X20 controllers are
capable of operating in any one of four program
memory modes, using combinations of on-chip and
external program memory. The functions of the multi-
plexed port pins depend on the program memory
mode selected, as well as the setting of the EBDIS bit.
In Microprocessor Mode, the external bus is always
active and the port pins have only the external bus
function.
In Microcontroller Mode, the bus is not active and
the pins have their port functions only. Writes to the
MEMCOM register are not permitted.
In Microprocessor with Boot Block or Extended
Microcontroller Mode, the external program memory
bus shares I/O port functions on the pins. When the
device is fetching or doing table read/table write
operations on the external program memory space, the
pins will have the external bus function. If the device is
fetching and accessing internal program memory loca-
tions only, the EBDIS control bit will change the pins
from external memory to I/O port functions. When
EBDIS = 0, the pins function as the external bus.
When EBDIS = 1, the pins function as I/O ports.
REGISTER 6-1:
MEMCON REGISTER
Note:
The External Memory Interface is not
implemented on PIC18F6X20 (64-pin)
devices.
Note:
Maximum FOSC for the PIC18FX520 is
limited to 25 MHz when using the external
memory interface.
R/W-0
U-0
R/W-0
U-0
R/W-0
EBDIS
—WAIT1
WAIT0
—
—WM1
WM0
bit7
bit0
bit 7
EBDIS: External Bus Disable bit
1
= External system bus disabled, all external bus drivers are mapped as I/O ports
0
= External system bus enabled and I/O ports are disabled
bit 6
Unimplemented: Read as ‘0’
bit 5-4
WAIT<1:0>: Table Reads and Writes Bus Cycle Wait Count bits
11
= Table reads and writes will wait 0 TCY
10
= Table reads and writes will wait 1 TCY
01
= Table reads and writes will wait 2 TCY
00
= Table reads and writes will wait 3 TCY
bit 3-2
Unimplemented: Read as ‘0’
bit 1-0
WM<1:0>: TBLWRT Operation with 16-bit Bus bits
1x
= Word Write mode: TABLAT<0> and TABLAT<1> word output, WRH active when
TABLAT<1> written
01
= Byte Select mode: TABLAT data copied on both MSB and LSB, WRH and (UB or LB)
will activate
00
= Byte Write mode: TABLAT data copied on both MSB and LSB, WRH or WRL will activate
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
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PIC18F8720T-E/PT 功能描述:8位微控制器 -MCU 25MHz 128KB Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC18F8720T-I/PT 功能描述:8位微控制器 -MCU 128KB 3840 RAM 68I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC18F8721-I/PT 功能描述:8位微控制器 -MCU 128kBF 4096RM 40MHz nonoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC18F8721T-I/PT 功能描述:8位微控制器 -MCU 128kBF 4096RM 40MHz nonoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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