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UPD70F3201 Datasheet(PDF) 50 Page - NEC

Part # UPD70F3201
Description  32-BIT SINGLE-CHIP MICROCONTROLLERS
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD70F3201 Datasheet(HTML) 50 Page - NEC

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Preliminary Product Information U15436EJ1V0PM
50
µµµµPD703201, 703201Y, 703204, 703204Y, 70F3201, 70F3201Y, 70F3204, 70F3204Y
16. ROM CORRECTION FUNCTION
The ROM correction function is a function that replaces part of a program in the mask ROM with a program in the
internal RAM for execution.
First, the address where the program replacement should start (correction address) is set in the correction address
register (CORADn). When the CPU reads the instruction of the address set in CORADn, the instruction is replaced
with the DBTRAP instruction and the program jumps to 00000060H.
A value that is the address saved in the DBPC minus 2 (address to which ROM correction generated) is compared
with the address set in CORADn, and the program jumps to the correction program on the corresponding RAM. After
executing the correction program, a restore address is set in the DBPC, the DBRET instruction is executed, and then
execution is restored to the normal program.
Up to four correction addresses can be specified in CORADn.
Remark n = 3
The following figure shows the configuration of ROM correction.
Instruction address bus
Correction control
register (CORENn bit)
DBTRAP instruction
generation block
ROM
(1 MB space)
Correction address
register (CORADn)
Comparator
Instruction replacement block
Instruction data bus
Remark n = 0 to 3


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