UPD78323 NEC, UPD78323 Datasheet - Page 17

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

(2) CALLT table area
instruction table in place of 0040H to 007FH.
(3) CALLF entry area
(4) On-chip RAM area
mapped onto the 36 bytes from FE06H to FE2BH and the 128 bytes from FE80H to FEFFH, respectively.
(5) Special function register (SFR) area
are mapped in the FF00H to FFFFH area. Addresses without mapped registers cannot be accessed.
(6) External memory area
(address bus) and RD, WR and ASTB signals.
way, the external memory can be accessed by SFR addressing.
is used, the program processing speed equal to that of the on-chip ROM can be obtained.
Note Maintenance product
32 tables of call addresses of 1-byte call instruction (CALLT) can be stored in the 0040H to 007FH 64-byte area.
If bit 1 (TPF) of CPU control word (CCW) is set to 1, the 8040H to 807FH external memory area is used as a CALLT
The 0800H to 0FFFH area can be directly subroutine-called by 2-byte call instruction (CALLF).
A 1024-byte RAM is built in FB00H to FEFFH. This area is composed of the following 2 RAMs.
The main RAM can be accessed at high speed.
In the main RAM area, the macro service control word and general register group composed of 8 register banks are
Registers having specially assigned functions, such as on-chip peripheral hardware mode registers and control registers,
The PD78324 can add external memories (ROM, RAM) to the 32K-byte (8000H to FFFFH) area.
The PD78323 can connect external memories (ROM, RAM) to the 64K-byte (0000H to FFFFH) area.
Each external memory can be accessed using P40/AD0 to P47/AD7 (multiplexed address/data bus), P50/A8 to P57/A15
The external access area is mapped in the FFD0H to FFDFH 16-byte area of the special function register (SFR). In this
Dedicated pins (TAS and TMD pins) are provided to connect turbo access manager ( PD71P301)
• Peripheral RAM : FB00H to FDFFH (768 bytes)
• Main RAM
: FE00H to FEFFH (256 bytes)
PD78323, 78324
Note
. If the PD71P301
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