參數(shù)資料
型號： PIC18LF96J65-I/PT
廠商： Microchip Technology
文件頁數(shù)： 28/131頁
文件大?。?/td> 0K
描述： IC PIC MCU FLASH 48KX16 100TQFP
標(biāo)準(zhǔn)包裝： 90
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 41.667MHz
連通性： EBI/EMI，以太網(wǎng)，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)： 70
程序存儲器容量： 96KB（48K x 16）
程序存儲器類型： 閃存
RAM 容量： 3808 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 100-TQFP
包裝： 托盤
2011 Microchip Technology Inc.
DS39762F-page 123
PIC18F97J60 FAMILY
8.7
8-Bit Data Width Mode
In 8-Bit Data Width mode, the external memory bus
operates only in Multiplexed mode; that is, data shares
the eight Least Significant bits of the address bus.
Figure 8-6 shows an example of 8-Bit Multiplexed mode
for 100-pin devices. This mode is used for a single 8-bit
memory connected for 16-bit operation. The instructions
will be fetched as two 8-bit bytes on a shared
data/address bus. The two bytes are sequentially
fetched within one instruction cycle (TCY). Therefore, the
designer must choose external memory devices accord-
ing to timing calculations based on 1/2 TCY (2 times the
instruction rate). For proper memory speed selection,
glue logic propagation delay times must be considered,
along with setup and hold times.
The Address Latch Enable (ALE) pin indicates that the
address bits, AD<15:0>, are available in the external
memory interface bus. The Output Enable signal (OE)
will enable one byte of program memory for a portion of
the instruction cycle, then BA0 will change and the
second byte will be enabled to form the 16-bit instruc-
tion word. The Least Significant bit of the address, BA0,
must be connected to the memory devices in this
mode. The Chip Enable signal (CE) is active at any
time that the microcontroller accesses external
memory, whether reading or writing. It is inactive
(asserted high) whenever the device is in Sleep mode.
This process generally includes basic EPROM and
Flash devices. It allows table writes to byte-wide
external memories.
During a TBLWT instruction cycle, the TABLAT data is
presented on the upper and lower bytes of the
AD<15:0> bus. The appropriate level of the BA0 control
line is strobed on the LSb of the TBLPTR.
FIGURE 8-6:
8-BIT MULTIPLEXED MODE EXAMPLE
AD<7:0>
A<19:16>(1)
ALE
D<15:8>
373
A<19:0>
A<x:1>
D<7:0>
OE
WR(2)
CE
Note
1:
The upper order address bits are used only for 20-bit address width. The upper AD byte is used
for all address widths except 8-bit.
2:
This signal only applies to table writes. See Section 7.1 “Table Reads and Table Writes”.
WRL
D<7:0>
PIC18F97J60
AD<15:8>(1)
Address Bus
Data Bus
Control Lines
CE
A0
BA0
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