参数资料
| 型号： | EP7311-CV-90 |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 17/42页 |
| 文件大小： | 0K |
| 描述： | IC ARM720T MCU 90MHZ 208-LQFP |
| 标准包装： | 36 |
| 系列： | EP7 |
| 核心处理器： | ARM7 |
| 芯体尺寸： | 32-位 |
| 速度： | 90MHz |
| 连通性： | 编解码器，EBI/EMI，IrDA，键盘，多媒体编解码器，SPI/Microwire1，UART/USART |
| 外围设备： | LCD，LED，MaverickKey，PWM |
| 输入/输出数： | 27 |
| 程序存储器类型： | ROMless |
| RAM 容量： | 56K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.3 V ~ 2.7 V |
| 振荡器型： | 外部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 208-LQFP |
| 包装： | 托盘 |
| 其它名称： | 598-1225 |
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24
4341H–MP3–10/07
AT8xC51SND2C/MP3B
7.
Data Memory
The AT8xC51SND2C provides data memory access in 2 different spaces:
1.
The internal space mapped in three separate segments:
–
The lower 128 Bytes RAM segment
–
The upper 128 Bytes RAM segment
–
The expanded 2048 Bytes RAM segment
2.
The external space.
A fourth internal segment is available but dedicated to Special Function Registers, SFRs,
(addresses 80h to FFh) accessible by direct addressing mode. For information on this segment,
refer to the Section “Special Function Registers”, page 31.
Figure 7-1 shows the internal and external data memory spaces organization.
Figure 7-1.
Internal and External Data Memory Organization
7.1
Internal Space
7.1.1
Lower 128 Bytes RAM
The lower 128 Bytes of RAM (see Figure 7-2) are accessible from address 00h to 7Fh using
direct or indirect addressing modes. The lowest 32 Bytes are grouped into 4 banks of 8 registers
(R0 to R7). 2 bits RS0 and RS1 in PSW register (see Table 7-4) select which bank is in use
according to Table 7-1. This allows more efficient use of code space, since register instructions
are shorter than instructions that use direct addressing, and can be used for context switching in
interrupt service routines.
Table 7-1.
Register Bank Selection
2K Bytes
Upper
128 Bytes
Internal RAM
Lower
128 Bytes
Internal RAM
Special
Function
Registers
80h
00h
7FFh
FFh
00h
FFh
64K Bytes
External XRAM
0000h
FFFFh
Direct Addressing
Addressing
0800h
7Fh
Internal ERAM
Direct or Indirect
Indirect Addressing
EXTRAM = 0
EXTRAM = 1
RS1
RS0
Description
0
Register bank 0 from 00h to 07h
0
1
Register bank 1 from 08h to 0Fh
1
0
Register bank 2 from 10h to 17h
1
Register bank 3 from 18h to 1Fh
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EP7311-CV-C | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE |
| EP7311-EB-C | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE |
| EP7311-ER-C | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE |
| EP7311-EV-C | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE |
| EP7311-IB | 功能描述:音频片上系统 - SoC IC Ultra Low PWR Hi Perf SOC w/LCD RoHS:否 制造商:Cirrus Logic |
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