參數(shù)資料
型號(hào)： P87CL881H
廠(chǎng)商： NXP Semiconductors N.V.
英文描述： Low-voltage microcontroller with 63-kbyte OTP program memory and 2-kbyte RAM(帶63K字節(jié)OTP程序存儲(chǔ)器和2K字節(jié)RAM的低壓微控制器)
中文描述： 低63字節(jié)OTP程序存儲(chǔ)器和2K字節(jié)RAM電壓微控制器（帶檢察官辦公室63K字節(jié)程序存儲(chǔ)器和2K字節(jié)的RAM的低壓微控制器）
文件頁(yè)數(shù)： 15/32頁(yè)
文件大小： 139K
代理商： P87CL881H
1999 Apr 16
15
Philips Semiconductors
Product specification
Low-voltage microcontroller with 63-kbyte
OTP program memory and 2-kbyte RAM
P87CL881H
6.4
OTP programming
6.4.1
OTP
PROGRAMMING
The 63-kbyte One-Time Programmable (OTP) memory
can be programmed by using an OM4260 programmer
together with a programmer adapter OM5510. Since the
memory is programmable only once, programming an
already programmed address results in a logical AND of
the old and new code. The OTP code can be read out by
the programmer for verification.
6.4.1.1
Signature bytes
The OTP memory contains three signature bytes which
can be read by the programmer to identify the device.
A special address space has been used for these bytes
which does not influence the user address space.
The values of the signature bytes are:
(030H) = 15H, indicates manufactured by Philips
Semiconductors
(031H) = D6H, indicates P87CL881H
(060H) = 00H, currently not used.
6.4.2
I
N
-S
YSTEM
P
ROGRAMMING MODE
In the In-System Programming mode the OTP can be
programmed under control of the CPU. A program to
control programming has to be available in the OTP. This
mode can be used to program several bytes in the OTP if
the chip is already in a system e.g. to store tuning
parameters.
In the In-System Programming mode the complete
address space OTP can be programmed.
The user should take care not to overwrite the existing
code.
For In-System Programming four SFRs are used to control
the OTP.
Table 8
SFRs for In-System Programming
SFR NAME
DESCRIPTION
OAH
OAL
ODATA
OISYS
OTP Address High Register
OTP Address Low Register
OTP Data Register
OTP In-System Register
6.4.2.1
OTP In-System Programming Register (OISYS)
The OISYS SFR controls the In-System Programming mode. The data that has to be programmed is stored in the SFR
ODATA and the address for this data in the SFRs OAH and OAL.
Table 9
OTP In-System Programming Register (SFR address DCH)
Table 10
Description of OISYS bits
7
6
5
4
3
2
1
0
VPon
0
SIG
WE
InSysMode
BIT
SYMBOL
VPon
0
SIG
WE
InSysMode
DESCRIPTION
7 to 5
4
3
2
1
0
These bits are reserved.
V
PP
status (read only).
This bit is reserved and must be kept to logic 0.
Signature bytes enable.
Write Enable, enables programming.
In-System Programming status bit.
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