TMP88CS38 datasheet(177/226 Pages) TOSHIBA

177 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-177

a. When reading either character code or character ornamentation data

(1) Set MFYWR to 0, MBK to 0, and RDWRV to 1.

(2) Write the most significant address bit of the display memory to DMA8. Go on

and write the 8 low-order address bits of the display memory to DMA7 to

DMA0.

(3) Reading character code or character ornamentation data

•

Reading character code

Read the most significant bit of character code to CRA8. Go on and read the

8 low-order bits of character code to CRA7 to CRA0. At this point in time,

DMA8 to DMA0 are automatically incremented.

•

Reading character ornamentation data

Read character ornamentation data SLNT, EUL, BLF, IDT, RDT, GDT, and

BDT. At this point in time, DMA8 through DMA0 are automatically

incremented.

(4) To read data (Character code or character ornamentation data) from

continuous addresses, repeat step (3).

b. When reading character code and character ornamentation data at a time

(1) Set MFYWR to 0, MBK to 1, and RDWRV to 1.

(2) Write the most significant address bit of the display memory to DMA8. Go on

and write the 8 low-order address bits of the display memory to DMA7 to

DMA0.

(3) Read character ornamentation data SLNT, EUL, BLF, IDT, RDT, GDT, and

BDT.

(4) Read the most significant bit of character code to CRA8. Read the 8 low-order

bits of character code to CRA7 to CRA0. At this point in time, DMA8 to DMA0

are automatically incremented.

(5) To read data from continuous addresses, repeat steps (3) and (4).

2. Read-modify-write mode

When writing data in read-modify-write mode, the display memory addresses

are automatically incremented as in normal mode, but when reading data in this

mode, the memory addresses are not automatically incremented.

Therefore, immediately after executing a read from some display memory

address, you can execute a write to the same display memory address. After

executing a write, the display memory addresses are automatically incremented.

a. Reading/writing either character code or character ornamentation data in

read-modify-write mode

(1) Set MFYWR to 1 and MBK to 0, and RDWRV to 1.

(2) Write the most significant address bit of the display memory to DMA8. Go on

and write the 8 low-order address bits of the display memory to DMA7 to

DMA0.

(3) Reading character code or character ornamentation data

•

Reading character code

Read the most significant bit of character code to CRA8. Read the 8

low-order bits of character code to CRA7 to CRA0. DMA8 to DMA0 are not

incremented.

TMP88CS38 Datasheet(PDF) 177 Page - Toshiba Semiconductor

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