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XA-G37 Datasheet(PDF) 33 Page - NXP Semiconductors

Part No. XA-G37
Description  XA 16-bit microcontroller family 32K OTP, 512 B RAM, watchdog, 2 UARTs
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

XA-G37 Datasheet(HTML) 33 Page - NXP Semiconductors

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Philips Semiconductors
Product data
XA-G37
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
2002 Mar 25
31
EPROM CHARACTERISTICS
The XA-G37 is programmed by using a modified Improved
Quick-Pulse Programming
™ algorithm. This algorithm is essentially
the same as that used by the later 80C51 family EPROM parts.
However different pins are used for many programming functions.
Detailed EPROM programming information may be obtained from
the internet at www.philipsmcu.com/ftp.html.
The XA-G37 contains three signature bytes that can be read and
used by an EPROM programming system to identify the device. The
signature bytes identify the device as an XA-Gx manufactured by
Philips.
Security Bits
With none of the security bits programmed the code in the program
memory can be verified. When only security bit 1 (see Table 6) is
programmed, MOVC instructions executed from external program
memory are disabled from fetching code bytes from the internal
memory. All further programming of the EPROM is disabled. When
security bits 1 and 2 are programmed, in addition to the above,
verify mode is disabled. When all three security bits are
programmed, all of the conditions above apply and all external
program memory execution is disabled. (See Table 6)
Table 6. Program Security Bits
PROGRAM LOCK BITS
SB1
SB2
SB3
PROTECTION DESCRIPTION
1
U
U
U
No Program Security features enabled.
2
P
U
U
MOVC instructions executed from external program memory are disabled from fetching code bytes
from internal memory and further programming of the EPROM is disabled.
3
P
P
U
Same as 2, also verify is disabled.
4
P
P
P
Same as 3, external execution is disabled. Internal data RAM is not accessible.
NOTES:
1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
™Trademark phrase of Intel Corporation.


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