FUJITSU MB91F109 FR30 - Manual (Page 424)

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APPENDIX D Notes on Using Little Endian Areas
/* 32-bit data is accessed with a ST (or LD) instruction.*/
ST r0, @r1
/* 16-bit data is accessed with a STH (or LDH) instruction. */
STH r2, @r3
/* 8-bit data is accessed with a STB (or LDB) instruction. */
STB r4, @r5
If the MB91F109 accesses data with an operation for of a different size, the data value cannot
be guaranteed. For example, when two consecutive 16-bit data areas are simultaneously
accessed using a 32-bit access instruction, the data values cannot be assured.