UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 52

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

1.7 DIFFERENCES AMONG
1.7.1 Functional Differences
12
Item
Internal ROM
Internal RAM
P40 to P47
P50 to P57
P60 to P63
P64, P65
ASTB/CLKOUT
Part Number
PD784026 SERIES PRODUCTS
Operate as address/data bus only
Operate as address bus only
Switchable between output-only port
and address bus in 2-bit units by
software
Operate as RD and WR pins only
Operates as ASTB pin only
512 bytes
PD784020
None
CHAPTER 1 GENERAL
PD784021
data bus by software
Switchable between general-purpose port and address
bus in 2-bit units by software
Operate as RD and WR pins when local bus interface is
used, and as general-purpose ports when not used
Switchable by software
Switchable between general-purpose port and address/
(Mask ROM)
48 K bytes
PD784025
2048 bytes
(Mask ROM)
64 K bytes
PD784026
(One-time PROM
PD78P4026
64 K bytes
or EPROM)