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CHAPTER 3 CPU ARCHITECTURE
(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) 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
The
µ
PD780973 Subseries have the following RAM.
(1) Internal high-speed RAM
Table 3-3. Internal High-Speed RAM Capacity
Product
Internal High-Speed RAM
µ
PD780973(A)
768
×
8 bits (FC00H to FEFFH)
µ
PD78F0974
1024
×
8 bits (FB00H to FEFFH)
The 32-byte area FEE0H to FEFFH is allocated with four general-purpose register banks composed of eight 8-
bit registers.
The internal high-speed RAM can be used as stack memory.
(2) LCD display RAM
An LCD display RAM is allocated to a 20
×
4 bits area consisting of FA59H to FA6CH. The LCD display RAM
can also be used as a normal RAM.
3.1.3 Special function register (SFR) area
An on-chip peripheral hardware special-function register (SFR) is allocated in the area FF00H to FFFFH (Refer
to 3.2.3 Special function registers (SFRs) Table 3-5 Special Function Register List).
Caution Do not access addresses where the SFR is not assigned.
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