PT6314 Datasheet, PDF (19/49 Pages) Texas Instruments – 3 Amp Adjustable Positive Step-down Integrated Switching Regulators

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Dot Character VFD Controller/Driver IC
PT6314
CPU INTERFACE (DATA TRANSFER)
M68 PARALLEL DATA TRANSFER
The M68 type of parallel data transfer is selected when IFSEL is set to “1” and MCU is set to “0” Under
this mode, the PT6314 can interface with the CPU in 4 or 8 bits . Please take note that the internal
registers are composed of 8 bits. During data transfer in 4 bits, DB4 to DB7 performs the data transfer
operation two times, the DB0 to DB3 must be set to either “H” or “L”. The higher order 4 bits (D4 to D7)
are initially transferred followed by the lower order 4 bits (D0 toD3). please refer to the diagrams below.
4-Bit M68 TYPE PARALLEL Data Transfer
RS
R/W
E
DB7
DB6
DB5
DB4
IR7
IR3
IR6
IR2
IR5
IR1
IR4
IR0
Write Instruction
IR7
IR3
IR6
IR2
IR5
IR1
IR4
IR0
Write Instruction
BF=0
IR3
IR6
IR2
IR5
IR1
IR4
IR0
Read Instruction
D7
D3
D6
D2
D5
D1
D4
D0
Write Data
PT6314 V1.3
- 19 -
March, 2006