參數(shù)資料
型號(hào)： M37753FFCHP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE CHIP 16 BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
中文描述： 單片微機(jī)16位CMOS閃存版
文件頁(yè)數(shù)： 31/67頁(yè)
文件大?。?/td> 525K
代理商： M37753FFCHP
31
MITSUBISHI MICROCOMPUTERS
M37753FFCFP
M37753FFCHP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
Flash memory mode 3 (CPU reprogramming
mode)
The M37753FFCFP and the M37753FFCHP have the CPU repro-
gramming mode where a built-in flash memory is handled by the cen-
tral processing unit (CPU). 112 Kbytes (addresses 001000
16
to
00EFFF
16
and addresses 011000
16
to 01EFFF
16
) of the 120-Kbyte
flash memory shown in Figure 1 can be reprogrammed (erase and
program). Remaining 8 Kbytes of the flash memory (addresses
00F000
16
to 010FFF
16
) cannot be reprogrammed, but can be read.
(It is possible to reprogram this remaining 8 Kbytes in the parallel I/O
mode and the serial I/O mode). This area of 8 Kbytes can be used as
an area where the control program of CPU reprogramming mode is
stored.
In CPU reprogramming mode, the flash memory is handled by writ-
ing and reading to/from the flash memory control register (see Fig-
ure 21) and the flash command register (see Figure 22).
The CNV
SS
pin is used as the V
PP
power supply pin in CPU repro-
gramming mode. It is necessary to apply the power-supply voltage of
V
PP
H from the external to this pin.
Functional outline (Parallel input/output
mode)
Figure 21 shows the flash memory control register bit configuration.
Figure 22 shows the flash command register bit configuration.
Bit 0 of the flash memory control register is the CPU reprogramming
mode select bit. When this bit is set to “1” and V
PP
H is applied to the
CNVss/V
PP
pin, the CPU reprogramming mode is selected. Whether
the CPU reprogramming mode is realized or not is judged by reading
the CPU reprogramming mode monitor flag (bit 3 of the flash
memory control register).
Bit 1 is a busy flag which becomes “1" during auto erase, erase, and
program execution.
Whether these operations have been completed or not is judged by
checking this flag after each command of auto erase, erase, and the
program is executed.
Bits 4, 5 of the flash memory control register are the erase/program
area select bits. These bits specify an area where auto erase, erase,
and program is operated. When the auto erase and the erase com-
mands are executed after an area is specified by these bits, only the
specified area is erased. Only for the specified area, programming is
enabled; for the other areas, programming is disabled.
Figure 23 shows the processor mode register 0 bit configuration in
the CPU reprogramming mode. Set bit 1 to “0” (single-chip or
memory expansion mode) in the CPU reprogramming mode. Set bit
2 (internal memory access bus cycle select bit) to “0.”
Be sure to set data length select flag m to “1" (8-bit length) before-
hand because writing and reading of data are operated in unit of
byte.
Fig. 21 Flash memory control register bit configuration
7
6
5
4
3
2
1
0
0
0
Flash memory control regsiter
CPU reprogramming mode select bit
(Not
0 : CPU reprogramming mdoe is invalid. (Normal operation mode)
1 : When applying 0 V or V
PP
L to CNV
SS
/V
PP
pin, CPU reprogramming mode is
invalid. When applying V
PP
H to CNV
SS
/V
PP
pin, CPU reprogramming mode is valid.
Auto erase/Erase/Program busy flag
0 : Auto erase, erase, and program are completed or not have been executed.
1 : Auto erase/erase/program is being executed.
CPU reprogramming mode monitor flag
0 : CPU reprogramming mode is invalid.
1 : CPU reprogramming mode is valid.
Erase/Program area select bits
0
: Addresses 001000
16
to 00EFFF
16
and addresses 011000
16
to 01EFFF
16
(total 112 Kbytes)
1 0 : Addresses 001000
16
to 00EFFF
16
(total 56 Kbytes)
1 1 : Addresses 011000
16
to 01EFFF
16
(total 56 Kbytes)
Fix this bit to “0.”
Fix this bit to “0.”
Notes 1:
Bit 0 can be reprogrammed only when 0 V is applied to the CNV
SS
/V
PP
pin.
2:
When bit 0 is “1,” the processor mode does not change even if V
PP
H is applied to the CNV
SS
/V
PP
pin.
Address
67
16
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