P8XC557E4 NXP Semiconductors, P8XC557E4 Datasheet - Page 53

• Manufacturer Part Number: P8XC557E4
• Description: The P80C557E4/P83C557E4/P89C557E4 (hereafter generically referred to as P8xC557E4) single-chip 8-bit microcontroller is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1999 Mar 02
Single-chip 8-bit microcontroller
*
RST
PSEN
ALE/WE
EA
UBS1, UBS0
In the program execution between 63k and 64k setting of UBS bits is not allowed.
External
Program
Memory
(EA = 0)
Start at 0000H in user program
7FFFH
USER MODE
64 K
63 K
32 K
0
0,0
External
Program
Figure 48. Program memory map and operation modes
Memory
(EA = X)
Security
X,X
Program
Memory
(EA = 1)
Internal
Byte
*
= UBS1, UBS0
internal
external
0,0
User-Boot selection bits in FMCON
53
P83C557E4/P80C557E4/P89C557E4
External
Program
Memory
(EA = 0)
Start in BOOTROM
BOOT MODE
64 K
63 K
32 K
0
1,1
BOOTROM
External
Program
Program
Memory
(EA = X)
Memory
Security
(EA = 1)
Internal
Byte
Product specification
High Level
Low Level
0,1