CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16899EJ2V0UD
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(2) CALLT instruction table area
The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruction (CALLT).
(3) Option byte area
The option byte area is assigned to the 1-byte area of 0080H. Refer to CHAPTER 24 OPTION BYTE for details.
(4) CALLF instruction entry area
The area 0800H to 0FFFH can perform a direct subroutine call with a 2-byte call instruction (CALLF).
3.1.2 Internal data memory space
78K0/KE1+ products incorporate the following RAMs.
(1) Internal high-speed RAM
Table 3-4. Internal High-Speed RAM Capacity
Part Number
Internal High-Speed RAM
µ
PD78F0132H 512
×
8 bits (FD00H to FEFFH)
µ
PD78F0133H
µ
PD78F0134H
µ
PD78F0136H
µ
PD78F0138H, 78F0138HD
1024
×
8 bits (FB00H to FEFFH)
The 32-byte area FEE0H to FEFFH is assigned to four general-purpose register banks consisting of eight 8-bit
registers per one bank.
This area cannot be used as a program area in which instructions are written and executed.
The internal high-speed RAM can also be used as a stack memory.
(2) Internal expansion RAM
Table 3-5. Internal Expansion RAM Capacity
Part Number
Internal Expansion RAM
µ
PD78F0132H
µ
PD78F0133H
µ
PD78F0134H
−
µ
PD78F0136H
µ
PD78F0138H, 78F0138HD
1024
×
8 bits (F400H to F7FFH)
The internal expansion RAM can also be used as a normal data area similar to the internal high-speed RAM, as
well as a program area in which instructions can be written and executed.
The internal expansion RAM cannot be used as a stack memory.
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