SyncMOS Technologies International, Inc.

SM59264

8-Bits Micro-controller

with 128KB flash & 1KB RAM & TWSI & SPWM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

Ver 2.1 SM59264 08/2006

9

Note: External RAM address structure for reading the on-chip data flash.

1.2.1 Data Memory - Lower 128 byte ($00 to $7F)

Data Memory $00 to $FF is the same as 8052.

The address $00 to $7F can be accessed by direct and indirect addressing modes.

Address $00 to $1F is register area.

Address $20 to $2F is memory bit area.

Address $30 to $7F is for general memory area.

1.2.2 Data Memory - Higher 128 byte ($80 to $FF)

The address $80 to $FF can be accessed by indirect addressing mode or by bank mapping direct addressing

mode.

Address $80 to $FF is data area.

1.3 Data Flash - ($0000 to $FFFF)

SM59264 has 64K byte on-chip data flash embedded. The 64KB on-chip data flash can be read by direct external

addressing mode (by MOVX instruction) which means user does not need to care about 17th flash address bit (FA16).

To read 64KB on-chip data flash is similar to read 64KB external RAM. However, to write (program) data flash is much

different from to read data flash. User need to use SyncMOS proprietary ISP function, such as byte program/chip

erase/page erase/protect, to the data flash. To do ISP function to data flash need to set FAU0 bit of ISPC ($F7) at first.

User has to recognize 64K program ROM flash and 64KB data flash as combined one single 128KB flash area for ISP

function. 64K byte data flash resides on top of the 64K byte program ROM flash. Please see ISP function description

on page 14 for detail.