參數(shù)資料
型號(hào)： EP7311-IV-90
廠商： Cirrus Logic Inc
文件頁(yè)數(shù)： 18/42頁(yè)
文件大小： 0K
描述： IC ARM720T MCU 90MHZ 208-LQFP
標(biāo)準(zhǔn)包裝： 36
系列： EP7
核心處理器： ARM7
芯體尺寸： 32-位
速度： 90MHz
連通性： 編解碼器，EBI/EMI，IrDA，鍵盤(pán)，多媒體編解碼器，SPI/Microwire1，UART/USART
外圍設(shè)備： LCD，LED，MaverickKey，PWM
輸入/輸出數(shù)： 27
程序存儲(chǔ)器類型： ROMless
RAM 容量： 56K x 8
電壓 - 電源 (Vcc/Vdd)： 2.3 V ~ 2.7 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 208-LQFP
包裝： 托盤(pán)
其它名稱： 598-1231
25
4341H–MP3–10/07
AT8xC51SND2C/MP3B
The next 16 Bytes above the register banks form a block of bit-addressable memory space. The
C51 instruction set includes a wide selection of single-bit instructions, and the 128 bits in this
area can be directly addressed by these instructions. The bit addresses in this area are 00h to
7Fh.
Figure 7-2.
Lower 128 Bytes Internal RAM Organization
7.1.2
Upper 128 Bytes RAM
The upper 128 Bytes of RAM are accessible from address 80h to FFh using only indirect
addressing mode.
7.1.3
Expanded RAM
The on-chip 2K Bytes of expanded RAM (ERAM) are accessible from address 0000h to 07FFh
using indirect addressing mode through MOVX instructions. In this address range, EXTRAM bit
in AUXR register (see Table 7-5) is used to select the ERAM (default) or the XRAM. As shown in
Figure 7-1 when EXTRAM = 0, the ERAM is selected and when EXTRAM = 1, the XRAM is
The ERAM memory can be resized using XRS1:0 bits in AUXR register to dynamically increase
external access to the XRAM space. Table 7-2 details the selected ERAM size and address
range.
Table 7-2.
ERAM Size Selection
Note:
Lower 128 Bytes RAM, Upper 128 Bytes RAM, and expanded RAM are made of volatile memory
cells. This means that the RAM content is indeterminate after power-up and must then be initial-
ized properly.
7.2
External Space
7.2.1
Memory Interface
The external memory interface comprises the external bus (port 0 and port 2) as well as the bus
control signals (RD, WR, and ALE).
Bit-Addressable Space
4 Banks of
8 Registers
R0-R7
30h
7Fh
(Bit Addresses 0-7Fh)
20h
2Fh
18h
1Fh
10h
17h
08h
0Fh
00h
07h
XRS1
XRS0
ERAM Size
Address
0
256 Bytes
0 to 00FFh
0
1
512 Bytes
0 to 01FFh
1
0
1K Byte
0 to 03FFh
1
2K Bytes
0 to 07FFh
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EP7311-IV-C 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
EP7311-IVZ 制造商:Cirrus Logic 功能描述:
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EP7311M-IBZ 功能描述:音頻片上系統(tǒng) - SoC SoC w/SDRAM RoHS:否 制造商:Cirrus Logic
EP7312 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
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