S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 416

• Manufacturer Part Number: S1D13704
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Page 12
2.3.2 User-Programmable Machine (UPM)
S1D13704
X26A-G-010-03
The UPM is typically used to control memory types, such as Dynamic RAMs, which have
complex control or address multiplexing requirements. The UPM is a general purpose
RAM-based pattern generator which can control address multiplexing, wait state gener-
ation, and five general-purpose output lines on the MPC821. Up to 64 pattern locations are
available, each 32 bits wide. Separate patterns may be programmed for normal accesses,
burst accesses, refresh (timer) events, and exception conditions. This flexibility allows
almost any type of memory or peripheral device to be accommodated by the MPC821.
In this application note, the GPCM is used instead of the UPM, since the GPCM has enough
flexibility to accommodate the S1D13504 and it is desirable to leave the UPM free to
handle other interfacing duties, such as EDO DRAM.
Interfacing to the Motorola MPC821 Microprocessor
Epson Research and Development
Vancouver Design Center
Issue Date: 01/02/12