m37280eksp Mitsumi Electronics, Corp., m37280eksp Datasheet - Page 14

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

12.2.10 Expansion ROM (only M37280MK-
The M37280MK-XXXSP/M37280EKSP can use 5-bank (total 20K
bytes) expansion ROM (4K bytes each bank) by setting the bank
register.
The expansion ROM is assigned to address 1B000
The contents of each bank in the expansion ROM are read by setting
the bank register and accessing addresses 1000
expansion ROM is not programmable, use it as data-dedicated area.
When using the expansion ROM area, the internal ROM at addresses
1000
Fig. 12.2.2 Bank Control Register
14
16
to 1FFF
XXXSP/M37280EKSP)
x x x x x x
16
(extra area) is not also programmable.
Bank Control Register
b7 b6 b5 b4 b3 b2 b1 b0
0
0
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
4, 5 Fix these bits to “0”.
6, 7 Bank control
to
B
0
3
Bank control register (BK) [Address 00ED
16
Bank
selection bits
(BK0 to BK3)
bits
(BK6, BK7)
to 1FFF
16
Name
to 1FFFF
M37280MF–XXXSP, M37280MK–XXXSP
16
. As the
Bank number is selected (bank 11 to 15)
b7
0
1
1
16
.
b6 Bank ROM Address 1000
0
1
Not used
Used
Used
Notes 1: When using the expansion ROM (BK7 = “1”), the ROM correction
Functions
2: When using the emulator MCU (M37280ERSS), as addresses 1000
3: When using the emulator MCU, the expansion ROM and the extra
4: For the M37280MK-XXXSP, fix bit 7 of the bank control register to
Read out from extra area
(programmable)
Read out the data
from area specified by
the bank selection bits
Read out from extra area
(data-dedicated)
function do not operate for addresses 1000
to FFFF
ter to “0,” the expansion ROM cannot be used. Addresses 2000
FFFF
area by the bank selection bits can be read by accessing addresses
1000
area cannot be emulated by setting bit 7 of the bank control register
to “1.” Therefore, write the data to this area before using.
“1.” For M37280MF-XXXSP, fix the address 00ED
access
16
]
16
16
to 1FFF
16
can be emulated by setting it to “1.” The data in specified
can be emulated by setting bit 7 of the bank control regis-
and ON-SCREEN DISPLAY CONTROLLER
16
16
level
MITSUBISHI MICROCOMPUTERS
.
After reset R W
0
0
0
M37280EKSP
R W
R W
R W
16
to 1FFF
16
to “00
16
.
16
Rev. 1.0
.”
16
16
to