UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 58

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.1.2 Internal data memory space
3.1.3 Special function register (SFR) area
(refer to Table 3-4 Special Function Register List in 3.2.3 Special function registers (SFRs)).
3.1.4 External memory space
This space can store programs and table data, and can be assigned to peripheral devices.
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(3) CALLF instruction entry area
The PD780988 Subseries are provided with the following RAM.
(1) Internal high-speed RAM
(2) Internal expansion RAM
Special function registers (SFRs) of on-chip peripheral hardware are allocated to the area of FF00H to FFFFH
Caution Do not access an address to which no SFR is allocated.
This is an external memory space that can be accessed by setting the memory expansion mode register (MEM).
A subroutine can be directly called from the area of addresses 0800H to 0FFFH by using a 2-byte call instruction
(CALLF).
The internal expansion RAM is allocated to the 1024-byte area FB00H to FEFFH. Four of these banks of
general-purpose registers with eight 8-bit registers per bank are allocated to the 32-byte area FEE0H to
FEFFH.
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.
In the PD780986, 780988, and 78F0988A only, the internal expansion RAM is allocated to the 1024-byte
area 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.
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U13029EJ7V1UD