Operational description, Operating mode, 1 mcu mode – Toshiba TMP87CP24AF User Manual
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TOSHIBA
TMP87PP24A
Operational Description
The
following
explains
the
TMP87PP24A
hardware
configuration
and
operation.
The
configuration
and
functions
of
the
TMP87PP24A
are
the
same
as
those
of
the
TMP87CM24A/CP24A,
except
in
that
a
one-time
PROM is used instead of an on-chip mask ROM.
The
TMP87PP24A
is
placed
in
the
single-clock
mode
during
reset.
To
use
the
dual-clock
mode,
the
low-
frequency
oscillator
should
be
turned
on
by
executing
[SET
(SYSCR2).
XTEN]
instruction
at
the
beginning
of
the program.
1. Operating Mode
The TMP87PP24A has two modes: MCU and PROM.
1.1
MCU Mode
The MCU mode is activated by fixing the TESTA/PP pin at low level.
In
the
MCU
mode,
operation
is
the
same
as
with
the
TMP87CM24A/CP24A
(the
TESTA/PP
pin
cannot
be
used open because it has no built-in pull-down resistance).
1.1.1
Program Memory
The
TMP87PP24A
has
a
48Kx8-bit
(addresses
4000
h
to
FFFF
h
in
the
MCU
mode,
addresses
14000
h
to
1
FFFF
h
in the PROM mode) of program memory (OTP).
When
the
TMP87PP24A
is
used
as
a
system
evaluation
of
the
TMP87CM24A/CP24A,
the
data
is
written
to
the program storage area show in Figure 1-1.
Note :
Either write the data FF
h
to the unused area or set the PROM programmer to access only the
program storage area.
OOOO
l
8000
h
FFFF
h
OOC)0
h
OOOOO
h
Don't use
8000
h
18000
h
Program
Program
Program
FFFF
h
1FFFF
h
TMP87CM24A
MCU mode
TMP87PP24A
(a) ROM Size = 32 Kbytes
PROM mode
OOOO
h
4000
h
FFFFu
OOOO
h
4000
h
FFFFu
OOOOO
h
18000
h
1FFFF
h
Don't use
Program
TMP87CP24A
MCU mode
PROM mode
TMP87PP24A
(b) ROM Size = 48 Kbytes
Figure 1-1. Program Memory Area
3
-
24-120
2002
-
10-03