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VFD
Description
VFD MCUs are built on 800 Core and have a VFD driver internally.

A VFD(vacuum fluorescent display) is a type of display used commonly on consumer-electronics equipment such as video cassette recorders, car radios, and microwave ovens. Unlike LCD(Liquid Crystal Display)s, a VFD emits a very bright light with clear contrast and can easily support display elements of various colours. The technology is related to both the cathode ray tube and the nixie tube. ( form Wikipedia, click here to see more about VFD )

Normally VFD driver IC is used to control it. Because it requires complex functions such as dynamic display method to save I/O pins and high voltage driving to display it. ABOV's VFD MCUs can do those functions with internal VFD driver. So it makes you can easily make your VFD application.

Becasue of that this product group is based on 800 Core, it inherited veriety merits like field proven reliability for several years and easy to use development tools.

And it provides OTP rom MCU and MASK version which has same functionality. MASK version means it has a mask rom whose contents are programmmed at manufacuraing time. It means you can not change the contents in MASK version MCU after manufactured. But it is more cheap for mass production. So normally OTP version is used for development and MASK version is used to mass production after developing code becomes stable.
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Product Overview
Developmet Tools
Technical Infomation
Rom type description
COMBI FLASH OTP MASK
VFD MCU Selection Guide
1. VFD driving voltage must be as high as it can emits VFD pannel's maximum brightness.

2. Number of high voltage pins : Number of Cathode and Anode pins are decides amount of displayable infomation.

3. Dynamic Display and Keyscan
To save VFD driving pins, time sharing method is used to display it. We call it 'Dynamic Display'. And it is possible to get pressed key with 'Dynamic Display'. We call it 'Keyscan'.

4. Pull Down Register
Pull-down register is used to dischare when VFD is truned off.
You have to know that Mask version has pull-down registers( which is configured by mask-option) but OTP version has not. Therefor an array resister is used for OTP version.


Device List
OTP rom, VFD MCU
Part No. Rom
(Byte)		 Ram
(Byte)		 Eeprom
(Byte)		 Package ADC Timer PWM I/O TWI Uart
(SCI)		 SIO
(SPI)		 POR Int.
OSC		 Remark Status
HMS87C2760
HMS81C2760		 60k 2k x

100MQFP

 10 bit
* 14 ch		 8bit * 8 ch
(16bit * 4 ch)		 2 52 x 1 2 x x 52 High
Voltage Pins
Key Scan		 NOW
HMS87C2748
HMS81C2748		 48k 2 52 x 1 2 x x
HMS87C2348
MC80C2348		 1k

64SDIP
64LQFP
64MQFP

 8 bit
* 5 ch		 8bit * 2 ch
(16bit * 1 ch)		 1 21 x x 2 x x 41 High
Voltage Pins
HMS81C2348 1 21 x x 2 x x
HMS87C2332
MC80C2332		 32k 1 21 x x 2 x x
HMS81C2332 1 21 x x 2 x x
HMS87C2248
MC80C2248		 48k

80TQFP
80MQFP

 8 bit
* 7 ch		 1 29 x x 2 x x 53 High
Voltage Pins
HMS81C2248 1 29 x x 2 x x
MC80C2260 60k 1 29 x x 2 x x
HMS87C2232
MC80C2232		 32k 1 29 x x 2 x x
HMS81C2232 1 29 x x 2 x x
GMS87C2020 20k 448 x

64SDIP
64MQFP
64LQFP

 8 bit
* 12 ch		 8bit * 2 ch
(16bit * 1 ch)		 1 56 x x 1 x x 30 High
Voltage Pins		 NOW
GMS81C2020 0 bit
* 12 ch		 1 56 x x 1 x x
GMS81C2012 12k 1 56 x x 1 x x
HMS81C2020A 20k 8 bit
* 12 ch		 1 56 x x 1 x x 30 High
Voltage Pins
HMS81C2012A 12k 1 56 x x 1 x x