TMP88CS38 datasheet(148/226 Pages) TOSHIBA

148 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-148

2.15.3

OSD Circuit Control

The OSD circuit performs control functions using the OSD control registers which reside

in addresses 0001DH to 0001FH and 00024H to 00025H in the special function registers

(SFR), and in addresses 0F80H to 0FBFH in the data buffer register (DBR). Section

2.15.5.9 shows the OSD control registers. The OSD control registers are used to set display

start position, display character designs (that is, fringing, smoothing, color data, character

size, and etc.), display memory addresses, and character codes.

Setting the display on-off control bit, DON, (Bit0 in ORDON) to “1” enables display

(Starts display). Setting DON to “0” disables display (Halts display).

Note:

The contents of OSD control registers except PIDS, P67S to P64S, ORCLKF, CRCLKC

are initialized in STOP mode. Then, OSD display clock does not stop in STOP mode.

Therefore, clear ORCLKC to “00H” when stop the OSD display clock.

2.15.4

OSD Control Register Write

There are lists of the OSD control registers on Figure 2.15-30 and Figure 2.15-31.

When data is written into a shaded register, the data is transferred to the OSD circuit,

and then the data becomes valid. After data is written into an unshaded register, the data

is transferred to the OSD circuit, and then the data becomes valid.

To transfer the contents of a control register to the OSD circuit, use data transfer request

Setting “1” in the RGWR register outputs the transfer request signal to the OSD circuit.

Three instruction cycles later, transfer of the written data to the OSD circuit starts. While

the data is being transferred, data transfer status monitoring flag RGWR (Bit2 in ORDON)

is “1”. When this transfer is completed, the flag is cleared to “0”.

Written data transfer register (1 bit) ....... RGWR (Bit2 in ORDON)

“0”

.........

Initialized state

“1”

.........

Transfers written data to OSD circuit.

(after transfer, RGWR is reset to 0.)

Note:

Don’t write “0” to RGWR.

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