m37280eksp Mitsumi Electronics, Corp., m37280eksp Datasheet - Page 54

• Manufacturer Part Number: m37280eksp
• Description: Single-chip 8-bit Cmos Microcomputer With Closed Caption Decoder And On-screen Display Controller
• Manufacturer: Mitsumi Electronics, Corp.

12.9 ROM CORRECTION FUNCTION
This can correct program data in ROM. Up to 2 addresses (2 blocks)
can be corrected, a program for correction is stored in the ROM cor-
rection memory in RAM. The ROM memory for correction is 32 bytes
Set the address of the ROM data to be corrected into the ROM cor-
rection address register. When the value of the counter matches the
ROM data address in the ROM correction address, the main pro-
gram branches to the correction program stored in the ROM memory
for correction. To return from the correction program to the main pro-
gram, the op code and operand of the JMP instruction (total of 3
bytes) are necessary at the end of the correction program. When the
blocks 1 and 2 are used in series, the above instruction is not needed
at the end of the block 1.
The ROM correction function is controlled by the ROM correction
enable register.
Notes 1: S p e c i f y t h e f i r s t a d d r e s s ( o p c o d e a d d r e s s ) o f e a c h
Fig. 12.9.2 ROM Correction Enable Register
54
2 blocks.
2: Use the JMP instruction (total of 3 bytes) to return from
3: Do not set the same ROM correction address to blocks 1
4: For the M37280MK-XXXSP and M37280EKSP, when using the ex-
x x x x x x x x
Block 1 : addresses 02C0
Block 2 : addresses 02E0
instruction as the ROM correction address.
the correction program to the main program.
and 2.
pansion ROM (BK7 = “1”), the ROM correction function do not oper-
ate used for addresses 1000
ROM Correction Enable Register
b7 b6 b5 b4 b3 b2 b1 b0
0
0
16
16
16
to1FFF
to 02DF
to 02FF
16
2, 3 Fix these bits to “0.”
to
B
0
1
4
7
. Note that on programming.
ROM correction enable register (RCR) [Address 0210
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
16
16
Nothing is assigned. These bits are write disable bits. When
these bits are read out, the values are “0.”
Block 1 enable bit (RCR0)
Block 2 enable bit (RCR1)
Name
M37280MF–XXXSP, M37280MK–XXXSP
Fig. 12.9.1 ROM Correction Address Registers
0: Disabled
1: Enabled
0: Disabled
1: Enabled
ROM correction address 1 (high-order)
ROM correction address 1 (low-order)
ROM correction address 2 (high-order)
ROM correction address 2 (low-order)
Functions
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
16
After reset R W
]
0
0
0
0
M37280EKSP
R W
R W
R W
R —
020C
020D
020E
020F
16
Rev. 1.0
16
16
16