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M35062 数据表(PDF) 28 Page - Renesas Technology Corp |
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M35062 数据表(HTML) 28 Page - Renesas Technology Corp |
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28 / 41 page  MITSUBISHI MICROCOMPUTERS M35062-XXXSP SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS 27 Notes on others 1. At system start-up __ At system start-up, always set the AC pin to low level before setting registers. 2. Power supply noise When power supply noise is generated, the internal oscillator circuit does not stabilize, whereby causing horizontal jitters across the pic- ture display. Therefore, connect a bypass capacitor between the power supply and GND. 3. At power on When power to the M35062-XXXSP is activated, characters are sometimes output without defining the internal display RAM, com- posite RAM and register. Also, immediately after power is turned on, up until the oscillator circuit stabilizes, data is sometimes not set cor- rectly in the register. Therefore, use the following start-up procedure. (a) __ Activate power. (AC pin = “L”) (b) __ Engage auto clear. (AC pin = “H”) (c) Disable data input for a 200 m sec (time enough to allow the internal oscillator circuit to stabilize). (d) Set register LEVEL n. (e) _ _ _ _ _ _ _ _ _ _ _ _ _ _ Set register PAL/NTSC. (f) Set register PC n. (g) Disable data input for a 20 m sec (time enough to allow the internal oscillator circuit to stabilize). (h) Set other registers. (i) Set the SYRAM. (j) Set the internal display RAM. (k) Turn registers DSPON and DSPONV on. 4. When resuming internal oscillation from the off state The internal oscillator circuit stops oscillating when register LEVEL 1 __ = 1, DSPON = 0, DSPONV = 0 and CS pin = “H”. When resuming internal oscillation from the off state, up until the os- cillator circuit stabilizes, data is sometimes not set correctly in the register. Therefore, start oscillation as follows. (a) __ CS pin = “H” (Oscillation off) (b) __ CS pin =“L” (Oscillation start) (c) Wait for a 20 m sec (time enough to allow the internal oscilla- tor circuit to stabilize). (d) Set register LEVEL 1 = 0. (e) Set other registers, SYRAM and internal display RAM. (f) Turn registers DSPON and DSPONV on. 5. Other notes on oscillation Make note of the fact that the internal oscillator circuit cannot stabi- lize in the below situations. (a) When the external composite video signal is discontinuous (when changing channels, etc.) (b) When register PC n setting is changed (c) When register LEVEL n setting is changed Before changing settings, turn registers DSPON and DSPONV off. Also, disable data input for 20 m sec after making settings. 6. When no external composite video signal is input Without a signal, characters cannot be displayed by external syn- chronization. Therefore, switch to internal synchronization. 7. When signal level of the external compos- ite video signal is extremely poor With a weak electric field, character display is uncontrollable by ex- ternal synchronization. Therefore, switch to internal synchronization. 8. When a crystal oscillator is used as the IC's fsc input It is possible to connect a crystal oscillator between OSCIN and OSCOUT to input the subcarrier frequency (fsc) signal to the OSCIN pin. Talk with the manufacturer of the crystal oscillator you want to use about matching it to this IC. However, when using a crystal oscillator, it is not possible to super- impose colors. Therefore, set the SCOR register (address 2B016 in DAI register) to “0”. Crystal oscillator frequency NTSC system: 3.580 MHz PAL system: 4.434 MHz M-PAL system: 3.576 MHz |
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