Microcontroller - Hitachi 42PD3200A Service Manual

SHUT DOWN SEQUENCE
Shut Down sequence for this product as follows.
-Set PDPGO or CPUGO "low". This product stops to display and outputs VSAGO "low".
- Cut Vs and Va after the confirmation of VSAGO "low". This product outputs VCEGO "low" after the
confirmation that Vs and Va are lower than set Values.
- Cut Vcc after the confirmation of VCEGO "low".
On daughter board 3.3 V (normal) is generating and transferring the voltages to main board. Main
board gets 5V stby, 5V, 3.3V and 15V.

8. MICROCONTROLLER

The Micronas SDA 55xx TV microcontroller is dedicated to 8 bit applications for TV control and provides
dedicated graphic features designed for modern low class to mid range TV sets. The SDA 55xx provides also
an integrated general purposefully 8051-compatible microcontroller with specific hardware features
especially suitable in TV sets. The microcontroller core has been enhanced to provide powerful features such
as memory banking, data pointers and additional interrupts, etc. The internal XRAM consists of up to 16
kBytes. The microcontroller provides an internal ROM of up to 128 kBytes. ROMless versions can access up
to 1 MByte of external RAM and ROM. The 8-bit microcontroller runs at 33.33 MHz internal clock. SDA 55xx
is realized in 0.25 micron technology with 2.5 V supply voltage for the core and 3.3 V for the I/O port pins to
make them TTL compatible. Based on the SDA 55xx microcontroller the MINTS software package was
developed and provides dedicated device drivers for many Micronas video & audio products and includes a
full blown TV control SW for the PEPER application chassis. The SDA 55xx is also supported with powerful
design tools like emulators from Hitex, Kleinhenz, iSystems, the Keil C51 Compiler and TEDIpro OSD
development SW by Tara Systems.
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