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M37274EFSP 参数 Datasheet PDF下载

M37274EFSP图片预览
型号: M37274EFSP
PDF下载: 下载PDF文件 查看货源
内容描述: 单片8位CMOS单片机结合闭合字幕解码器和屏幕显示控制器 [SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER]
分类和应用: 解码器显示控制器微控制器和处理器外围集成电路光电二极管瞄准线计算机可编程只读存储器时钟
文件页数/大小: 148 页 / 1926 K
品牌: RENESAS [ RENESAS TECHNOLOGY CORP ]
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MITSUBISHI MICROCOMPUTERS  
M37274EFSP  
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER  
and ON-SCREEN DISPLAY CONTROLLER  
DISPLAY OSCILLATION CIRCUIT  
ADDRESSING MODE  
The OSD oscillation circuit has a built-in clock oscillation circuits, so  
that a clock for OSD can be obtained simply by connecting an LC, a  
ceramic resonator, or a quartz-crystal oscillator across the pins OSC1  
and OSC2. Which of the sub-clock or the OSD oscillation circuit is  
selected by setting bits 5 and 4 of the clock source control register  
(address 021616).  
The memory access is reinforced with 17 kinds of addressing modes.  
Refer to SERIES 740 <Software> User’s Manual for details.  
MACHINE INSTRUCTIONS  
There are 71 machine instructions. Refer to SERIES 740 <Soft- ware>  
User’s Manual for details.  
PROGRAMMING NOTES  
(1) The divide ratio of the timer is 1/(n+1).  
(2) Even though the BBC and BBS instructions are executed imme-  
diately after the interrupt request bits are modified (by the pro-  
gram), those instructions are only valid for the contents before  
the modification. At least one instruction cycle is needed (such as  
an NOP) between the modification of the interrupt request bits  
and the execution of the BBC and BBS instructions.  
OSC1  
OSC2  
L
C1  
C2  
(3) After the ADC and SBC instructions are executed (in the decimal  
mode), one instruction cycle (such as an NOP) is needed before  
the SEC, CLC, or CLD instruction is executed.  
(4) An NOP instruction is needed immediately after the execution of  
a PLP instruction.  
Fig. 111. Display Oscillation Circuit  
(5) In order to avoid noise and latch-up, connect a bypass capacitor  
(0.1 mF) directly between the VCC pin–VSS pin, AVCC pin–VSS  
pin, and the VCC pin–CNVSS pin, using a thick wire.  
AUTO-CLEAR CIRCUIT  
When a power source is supplied, the auto-clear function will oper-  
______  
ate by connecting the following circuit to the RESET pin.  
Circuit example 1  
Vcc  
RESET  
Vss  
Circuit example 2  
RESET  
Vcc  
Vss  
Note : Make the level change from “L” to “H” at the point at  
which the power source voltage exceeds the specified  
voltage.  
Fig. 112. Auto-clear Circuit Example  
106  
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