TMP88CU74F datasheet(49/132 Pages) TOSHIBA

49 / 132 page

TMP88CU74

2003-02-17

88CU74-49

2.2.8

Port 7 (P77 to P70)

Port 7 is an 8-bit high-breakdown voltage input/output port, and also used as a VFT

driver output, which can directly drive vacuum fluorescent tube (VFT).

When used as an VFT driver output, the output latch should be cleared to “0”.

Pins not used for VFT driver output can be used as I/O ports.

When use an VFT driver and normal input/output at the same time, VFT driver output

data buffer memory (DBF) need to cleared to “0”.

The output latches are initialized to “0” during reset.

It recommends that port 7 shoud be used to drive directly drive vacuum fluorescent tube

(VFT), since this port has a pull down resistance.

P77

P76

P75

P74

P73

P72

P71

P70

(00007H)

V15

V14

V13

V12

V11

V10

(Initial value: 0000 0000)

Figure 2.2.9 Port P7

Data input

Data output

VFT driver output

CMP/MCMP/TEST/Others

Output latch

D Q

SET/CLR/

CPL/Others

Note: i = 7 to 0

VKK

P7i

2007-10-19

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