ViewSonic VG150m-1 Service Manual page 23

MPU
VG150m is controlled by a µ-controlled SM5964.
Description of SM5964
The SM5964 series product is an 8 – bit single chip microcontroller with 64KB flash & 1K byte RAM embedded.
It has In-System Programming (ISP) function and is a derivative of the 8052 microcontroller family. It has
5-channel SPWM build-in. User can access on-chip expanded RAM with easier and faster way by its 'bank
mapping direct addressing mode' scheme. With its hardware features and powerful instruction set, it's straight
forward to make it a versatile and cost effective controller for those applications which demand up to 32 I/O pins
for PDIP package or up to 36 I/O pins for PLCC/QFP package, or applications which need up to 64K byte flash
memory either for program or for data or mixed.
To program the on-chip flash memory, a commercial writer is available to do it in parallel programming method.
The on-chip flash memory can be programmed in either parallel or serial interface with its ISP feature.
Ordering Information
SM5964ihhk (blank chip)
SM5964ihh – yyyk
I: process identifier {C, L}
hh: working clock in MHz {40}.
yyy: production code {001,...,999}
k: package type postfix {as below table}
ViewSonic Corporation
FIG4-1 SM5964 Pin Configuration
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Confidential - - Do Not Copy VG150m/mb