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M35060 数据表(PDF) 29 Page - Renesas Technology Corp |
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M35060 数据表(HTML) 29 Page - Renesas Technology Corp |
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29 / 42 page  28 SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS M35060-XXXSP MITSUBISHI MICROCOMPUTERS PRECAUTIONS 1. Note for when starting of system Before setting registers at the starting of system, be sure to re- set the M35060-XXXSP by applying “L” level to the AC pin. 2. When power supply noise is generated, the internal oscillator circuit does not stabilize, whereby causing horizontal jitters across the picture display. Therefore, connect a bypass capaci- tor between the power supply and GND. 3. Note for when throwing power supply into the M35060-XXXSP When power to the M35060-XXXSP is activated, characters are sometimes output without defining the internal display RAM, composite RAM and register. Also, immediately after power is turned ON, up until the oscillator circuit stabilizes, data is some- times not set correctly in the register. Therefore, use the follow- ing start-up procedure. (a) Throwing power supply into the M35060-XXXSP(AC pin = “ L ”) (b) Auto-clear releasing (AC pin = “H”) (c) 200 ms waiting state (stabilization period of internal oscillation circuit) Data input is forbidden. (d) Set register LEVELn (e) Set register PAL/NTSC (f) Set register PCn (g) 20 ms waiting state (stabilization period of internal oscillation circuit) Data input is forbidden. (h) Set other registers (i) Set SYRAM (j) Set display RAM (k) Set register DSPON and register DSPONV to display ON 4. Precautions when resuming internal oscillation from the OFF state. The internal oscillator circuit stops oscillating when register LEVEL = 1, DSPON = 0, DSPONV = 0 and CS terminal = H. When resuming internal oscillation from the OFF state, up until the oscillator circuit stabilizes, data is sometimes not set cor- rectly in the register. Therefore, start oscillation as follows. (a) CS pin = “H” (oscillation stop) (b) CS pin = “L” (oscillation start) (c) 20 ms waiting state (stabilization period of internal oscillation circuit) (d) Set register LEVEL 1 = 0 (e) Set other registers: SYRAM, display RAM (f) Set register DSPON and register DSPONV to display ON 5. Note for oscillation Make note of the fact that the internal oscillator circuit cannot stabilize in the below situations. (a)When the external composite video signal is discontinuous (changing channels etc.) (b) When change the setting of register PCn (c) When change the setting of register LEVELn When (a)~(c), set the display to OFF by registers DSPON and DSPONV before change the setting. Other registers’ settings are forbidden during 20ms after the setting. 6. When no external composite video signal is input (Without a sig- nal, characters cannot be displayed by external synchronization. Therefore, switch to internal synchronization.) 7. When signal level of the external composite video signal is ex- tremely poor (With a weak electric field, character display is un- controllable by external synchronization. Therefore, switch to internal synchronization.) 8. When a crystal oscillator is connected to OSCIN (22-pin) or OSCOUT (21-pin) (Talk with the manufacturer of the crystal os- cillator you are using about matching it to this IC.) |
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