tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 48

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

2.2.7
Port 6 (P67 to P60)
driver output, which can directly drive vacuum fluorescent tube (VFT).
data buffer memory (DBF) need to cleared to “0”.
(VFT), since this port has a pull down resistance.
Port 6 is an 8-bit high-breakdown voltage input/output port, and also used as a 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
The output latches are initialized to “0” during reset.
It recommends that port 6 shoud be used to drive directly drive vacuum fluorescent tube
P6
(00006H)
Data output
Data input
P67
V7
7
Output latch
Figure 2.2.8 Port P6
P66
D Q
V6
6
SET/CLR/
88CU74-48
P65
CMP/MCMP/TEST/Others
V5
5
CPL/Others
P64
V4
4
P63
V3
3
(Initial value: 0000 0000)
P62
V2
2
VKK
P61
V1
Note: i = 7 to 0
1
P6i
P60
V0
0
TMP88CU74
2007-10-19
2003-02-17