tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 117

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.13 Vacuum Fluorescent Tube (VFT) Driver Circuit
2.13.1
fluorescent tubes, and a display control circuit used to automatically transfer display data to
the output port.
are not allocated. The segment and the digit can be freely allocated in the timing (T0 to T15)
which is specified according to the display tube types and the layout.
The TMP88CU74 features built-in high-breakdown voltage output buffers for directly driving
The segment and the digit, as it is the VFT drive circuit which included in the usual products,
Functions
(1) 37 high-breakdown voltage output buffers built-in.
(2) The dynamic lighting system makes it possible to select 1 to 16 digits (T0 to T15) by
(3) Pins not used for VFT driver can be used as general-purpose ports.
(4) Display data (112 bytes in DBR) are automatically transferred to the VFT output pin.
(5) Brightness level can be adjusted in 8 steps using the dimmer function.
(6) Table 2.13.1 shown in setting of display time.
•
program.
•
There is also the VKK pin used for the VFT drive power supply.
Large current output pin (typ. 20 mA) 37 (V0 to V36)
Pins can be selected using the VSEL (bits 4 to 0) in VFT control register1 bit by bit.
Table 2.13.1 Setting of Display Time
DV1CK = 0 [s] DV1CK = 1 [s]
2
2
2
2
10
11
12
13
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88CU74-117
2
2
2
2
10
11
12
13
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TMP88CU74
2007-10-19
2003-02-17