4513_03 Datasheet, PDF (34/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

HARDWARE
FUNCTION BLOCK OPERATIONS
DATA MEMORY (RAM)
1 word of RAM is composed of 4 bits, but 1-bit manipulation (with
the SB j, RB j, and SZB j instructions) is enabled for the entire
memory area. A RAM address is specified by a data pointer. The
data pointer consists of registers Z, X, and Y. Set a value to the
data pointer certainly when executing an instruction to access
RAM.
Table 2 shows the RAM size. Figure 12 shows the RAM map.
Table 2 RAM size
Product
M34513M2
M34513M4/E4
M34513M6
M34513M8/E8
M34514M6
M34514M8/E8
RAM size
128 words ! 4 bits (512 bits)
256 words ! 4 bits (1024 bits)
384 words ! 4 bits (1536 bits)
384 words ! 4 bits (1536 bits)
384 words ! 4 bits (1536 bits)
384 words ! 4 bits (1536 bits)
RAM 384 words ! 4 bits (1536 bits)
Register Z
0
Register X 0 1 2 3 4 5 6 7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
M34513M6
14
M34513M8/E8
15
M34514M6 _{Z=0, X=0 to 15}
M34514M8/E8 _{Z=1, X=0 to 7}
M34513M4/E4 Z=0, X=0 to 15
1
15 0 1 2 3 4 5 6 7
256 words
384 words
M34513M2 Z=0, X=0 to 7
128 words
Fig. 12 RAM map
4513/4514 Group User’s Manual
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