TMP88CS38 datasheet(187/226 Pages) TOSHIBA

187 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-187

(Example 1) fOSC = 8 MHz

Frequency error when ORCLKC is 35H (at the 8 MHz setting).

When the low-order 3 bits are 000, the value of the 11-bit counter is 424 (1A8),

so the frequency is 7.97 MHz.

When the low-order 3 bits are 111, the value of the 11-bit counter is 431 (1AF),

so the frequency is 8.10 MHz.

1 dot in the errors above is 2 ns (max).

The effect of the 24th character in the display.

Display position error: 16 dots

× (24th character − 1) × 1 dot error = 16 × 23 × 2 =

736 ns.

This is approximately equivalent to 6 dot error for the character display.

(Example 2) fOSC = 16 MHz

Frequency error when ORCLKC is 6AH (at the 16 MHz setting).

When the low-order 3 bits are 000, the value of the 11-bit counter is 848 (350), so

the frequency is 15.94 MHz.

When the low-order 3 bits are 111, the value of the 11-bit counter is 855 (357), so

the frequency is 16.07 MHz.

1 dot in the errors above is 0.52 (max).

The effect of the 24th character in the display.

Display position error: 16 dots

× (24th character − 1) × 1 dot error = 16 × 23 ×

0.52

= 191.4 ns.

This is approximately equivalent to 3.1 dot error for the character display.

High period of HD signal

15.7 kHz (63.7

μs)

53.2

μs

fOSC

6 dots

23 characters display

3.1 dots

23 characters display

TMP88CS38 Datasheet(PDF) 187 Page - Toshiba Semiconductor