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參數(shù)資料
| 型號： | W78C438C40FL |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | ROHS COMPLIANT, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 266K |
| 代理商： | W78C438C40FL |
W78C438C
Publication Release Date: December 4, 2006
- 7 -
Revision A6
5. FUNCTIONAL DESCRIPTION
The W78C438C is a functional extension of the W78C58 microcontroller. It contains a 256
×
8 RAM,
64 KB program/1 MB data memory address or memory-mapped chip select logic, two 8-bit address
ports, one 8-bit data port, five general I/O ports, four external interrupts, three timers/counters, and
one serial port.
5.1 Dedicated Data and Address Port
The W78C438C provides four general-purpose I/O ports for W78C32 applications; the address and
data bus are separated from Port 0 and Port 2 so that these ports can be used as general-purpose I/O
ports. In this product, DP4 is the data bus for external ROM and RAM, AP5<7:0> are the low byte
address, AP6<7:0> are the high byte address,
PSEN
enables the external ROM to DP4, and P3.6
(
WR
) and P3.7 (
RD
) are the write/read control signals for the external RAM. The external latch for
multiplexing the low byte address is no longer needed in this product. The W78C438C uses AP5 and
AP6 to support 64 KB external program memory and 64 KB external data memory, just as a standard
W78C32 does.
The W78C438C provides four pins, AP7.3
AP7.0 (CS3
CS0), to support either 64 KB program/1 MB
data memory space or memory-mapped chip select logic. Bit 7 of the EPMA (Extended Program
Memory Address) register, which is described in Table 1 below, determines the functions of these
pins.
When this bit is "0" (the default value), AP7<3:0> support external program/data memory addresses
up to 64 KB/1 MB for applications which need additional external memory to store large amounts of
data.
Although there is 1M bytes memory space, instructions stored here can not be run at full range of this
area except the first 64 Kbytes. It is owing to the fact that during the instruction fetch cycle, AP7<3:0>
always output 0s to address lines A19
A16. This limits the program code to store at address
0
0FFFFH (64K). The rest of the area (10000H
FFFFFH) can be treated as ROM data storage which
can be read by "MOVC A, @A+DPTR" instruction.
When "MOVC A, @A+DPTR" is executed to read the external ROM data or "MOVX dest, src" is
executed to access the external RAM data, AP7<3:0> output address <19:16> from bits <3:0> of the
EPMA (Extended Program Memory Address) register. At other times, AP7<3:0> always output 0H to
ensure the instruction fetch is within the 64K program memory address. Different banks can be
selected by modifying the content of the EPMA register before the execution of "MOVC A, @A+DPTR"
or "MOVX dest, src."
[Example]. Access the external ROM/RAM data from external memory space.
CLR
A
; Clear Accumulator.
MOV
DPTR, #0H
; Clear DPTR.
MOV
0A2H, #02
; Initialize EPMA(0A2H). EPMA.7 = 0: extended memory space
; EPMA.<3:0> = 0010B, the address range: 20000
2FFFFH.
MOVC
A, @A+DPTR ; Read the external ROM data from location 20000H.
MOVX
A, @DPTR
; Read the external RAM data from location 20000H.
CLR
A
MOV
0A2H, #03H
; EPMA.<3:0> = 0011B, the address range: 30000H
3FFFFH.
MOVC
A, @A+DPTR ; Read the external ROM data from location 30000H.
MOVX
@DPTR, A
; Write the contents of Accumulator to external RAM data.
; location 30000H.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78C438C40PL | 功能描述:IC MCU 8-BIT ROMLESS 84-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W78 標準包裝:60 系列:PSOC® 3 CY8C38xx 核心處理器:8051 芯體尺寸:8-位 速度:67MHz 連通性:EBI/EMI，I²C，LIN，SPI，UART/USART 外圍設備:電容感應，DMA，LCD，POR，PWM，WDT 輸入/輸出數(shù):25 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:2K x 8 RAM 容量:8K x 8 電壓 - 電源 (Vcc/Vdd):1.71 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 2x20b，D/A 4x8b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-VFQFN 裸露焊盤 包裝:托盤 |
| W78C438CF-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78C438CF-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78C438CP-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78C438CP-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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