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Subject: Re: Updated schematic of AJB

Re: Updated schematic of AJB

From: Björn Stenberg <>
Date: Thu, 13 Dec 2001 22:41:12 +0100 (CET)

Andrew Jamieson wrote:

> The LCD seems to be controlled serialy, with physical connections to only
> four port pins (PA8, PB1, PB2, & PB3)

Can you double-check those pins? I found some code at 0xE050 that mucks about
a great deal with PB2 and PB3 but nothing with PA8. And at the end of this
subroutine, it raises PB0 and then PB1. So I think PB0 is D/C and PB1 CS1.

> The plethora of capacitors connected to the LCD makes me think it may be a
> SSD1815R1 controller (or similar) as well.

The code matches the serial interface timing charts in the SSD1815 datasheet
too, so you're probably right.

> I2C to ISD: The I2C bus does not seem to be connected to the ISD chip.

According to the ISD200 datasheet, there's not much fun you can do with the
I2C bus anyway. The ISD just uses it to read optional configuration data from
an eeprom.

Received on 2001-12-13

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