參數(shù)資料
型號: C8051F019-GQR
廠商: Silicon Laboratories Inc
文件頁數(shù): 127/154頁
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 48TQFP
產(chǎn)品培訓(xùn)模塊: Serial Communication Overview
標(biāo)準(zhǔn)包裝: 500
系列: C8051F018
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-TQFP
包裝: 帶卷 (TR)
C8051F018
C8051F019
10. EXTERNAL RAM
The C8051F018/9 includes 1024 bytes of RAM mapped into the external data memory space. All of these address
locations may be accessed using the external move instruction (MOVX) and the data pointer (DPTR), or using
MOVX indirect addressing mode. If the MOVX instruction is used with an 8-bit address operand (such as @R1),
then the high byte of the 16-bit address is provided by the External Memory Interface Control Register (EMI0CN as
shown in Figure 10.1). Note: the MOVX instruction is also used for writes to the Flash memory. See Section
9 for details. The MOVX instruction accesses XRAM by default (i.e. PSTCL.0 = 0).
For any of the addressing modes the upper 5-bits of the 16-bit external data memory address word are “don’t cares”.
As a result, the 1024-byte RAM is mapped modulo style over the entire 64k external data memory address range.
For example, the XRAM byte at address 0x0000 is also at address 0x0400, 0x0800, 0x0C00, 0x1000, etc. This is a
useful feature when doing a linear memory fill, as the address pointer doesn’t have to be reset when reaching the
RAM block boundary.
Figure 10.1. EMI0CN: External Memory Interface Control
R
R/W
Reset Value
-
PGSEL1
PGSEL0
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xAF
Bits 7-2: Not Used – reads 000000b
Bits 1-0: PGSEL[1:0]: XRAM Page Select Bits
The XRAM Page Select Bits provide the high byte of the 16-bit external data memory
address when using an 8-bit MOVX command, effectively selecting a 256-byte page of
RAM. The upper 6-bits are “don’t cares”, so the 1k address blocks are repeated modulo
over the entire 64k external data memory address space.
00: xxxxxx00b
01: xxxxxx01b
10: xxxxxx10b
11: xxxxxx11b
Rev. 1.2
74
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