參數(shù)資料
型號: R5F56218BDBG#U0
廠商: Renesas Electronics America
文件頁數(shù): 123/148頁
文件大小: 0K
描述: MCU 32BIT FLASH 512KROM 176LFBGA
產(chǎn)品培訓模塊: RX Compare Match Timer
RX DMAC
標準包裝: 1
系列: RX600
核心處理器: RX
芯體尺寸: 32-位
速度: 100MHz
連通性: CAN,EBI/EMI,I²C,SCI,SPI,USB
外圍設備: DMA,LVD,POR,PWM,WDT
輸入/輸出數(shù): 126
程序存儲器容量: 512KB(512K x 8)
程序存儲器類型: 閃存
RAM 容量: 96K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10/12b,D/A 2x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 176-LFBGA
包裝: 托盤
PIC18F6520/8520/6620/8620/6720/8720
DS39609B-page 74
2004 Microchip Technology Inc.
6.2.2
16-BIT WORD WRITE MODE
Figure 6-2 shows an example of 16-bit Word Write
mode for PIC18F8X20 devices. This mode is used for
word-wide memories, which includes some of the
EPROM and Flash type memories. This mode allows
opcode fetches and table reads from all forms of 16-bit
memory and table writes to any type of word-wide
external memories. This method makes a distinction
between TBLWT cycles to even or odd addresses.
During
a
TBLWT
cycle
to
an
even
address
(TBLPTR<0> = 0), the TABLAT data is transferred to a
holding latch and the external address data bus is
tri-stated for the data portion of the bus cycle. No write
signals are activated.
During
a
TBLWT
cycle
to
an
odd
address
(TBLPTR<0> = 1), the TABLAT data is presented on
the upper byte of the AD15:AD0 bus. The contents of
the holding latch are presented on the lower byte of the
AD15:AD0 bus.
The WRH signal is strobed for each write cycle; the
WRL pin is unused. The signal on the BA0 pin indicates
the LSb of TBLPTR, but it is left unconnected. Instead,
the UB and LB signals are active to select both bytes.
The obvious limitation to this method is that the table
write must be done in pairs on a specific word boundary
to correctly write a word location.
FIGURE 6-2:
16-BIT WORD WRITE MODE EXAMPLE
AD<7:0>
PIC18F8X20
AD<15:8>
ALE
373
A<20:1>
373
OE
WRH
A<19:16>
A<x:0>
D<15:0>
OE
WR(1)
CE
D<15:0>
JEDEC Word
EPROM Memory
Address Bus
Data Bus
Control Lines
Note 1:
This signal only applies to table writes. See Section 5.1 “Table Reads and Table Writes”.
CE
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