
220
Rev. 1.1
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA SLICER and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306H1SFP
Other Notes
(1) Timing of power supplying
The power need to supply to VCC, VDD1, VDD2, VDD3 and AVCC at a time. While operating, must set same
voltage.
(2) Power supply noise and latch-up
In order to avoid power supply noise and latch-up, connect a bypass capacitor (more than 0.1
F) directly
between the VCC pin and VSS pin, VDD1 pin and VSS1 pin, VDD2 pin and VSS2 pin, VDD3 pin and VSS3 pin,
AVCC pin and AVSS pin using a heavy wire.
(3) After the reset
After the reset, until the oscillator circuit stabilizes, data is sometimes not set correctly in the display RAM,
font RAM, SYRAM and VBIRAM. Therefore, use the following start-up procedure.
(a) Reset release.
(b) Set expansion register CK_VCO, XTAL_VCO, PDC_VCO_ON,VPS_VCO_ON = “H”. (oscillation start)
(c) Set expansion register SYNCSEP_ON0 = “H”.
(d) Set expansion register NXP = “H”.
(e) Set expansion register PCn, DIV_PDCn, DIV_PDCSn, DIV_VPSn, DIV_VPSSn.
(f) Disable data input for a 20 m sec (time enough to allow theinternal oscillator circuit to stabilize).
(g) Set other expansion registers.
(h) Set the SYRAM.
(i) Set the display RAM.
(j) Set expansionregister DSPON and DSPONV to display ON.
(k) Possible to access slice RAM.
(4) When resuming internal oscillation from the off state
The each internal oscillator circuit of expansion function stops oscillating when expansion register
CK_VCO,XTAL_VCO,PDC_VCO_ON,VPS_VCO_ON = “L”.
When resuming internal oscillation from the off state, up until the oscillator circuit stabilizes, data is some-
times not set correctly in the display RAM , font RAM, SYRAM and VBIRAM. Therefore, start oscillation
as follows.
(a) Set expansion register CK_VCO = “H”.
(b) Set expansion register XTAL_VCO = “H”.
(c) Set expansion register PDC_VCO_ON= “H”, VPS_VCO_ON = “H”.
(Necessity none when data sliceris not used)
(d) Wait for a 20 m sec. (time enough to allow the internal oscilla-tor circuit to stabilize)
(e) Access the other memories.
Especially, set expansion register XTAL_VCO = “H” when access to display RAM, font RAM, SYRAM,
VBIRAM and slice RAM. And input 4.43 MHz sub carrier frequency clock from the FSCIN pin.
Access the memory after waiting for 20ms certaninly when resuming synchronous oscillation from the
off state, and begin to input clock into the FSCIN pin.