UPD784938 Datasheet, PDF (665/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 27 ROM CORRECTION
27.2 ROM Correction Configuration
ROM correction is composed of the following hardware.
Table 27-2. ROM Correction Configuration
Item
Register
Control register
Configuration
ROM correction address register H, L (CORAH, CORAL)
ROM correction control register (CORC)
A ROM correction block diagram is shown in Figure 27-1, and Figure 27-2 shows an example of memory mapping.
Figure 27-1. ROM Correction Block Diagram
Program counter (PC)
Comparator
Match
Correction branch
process request signal
(CALLT command)
Correction address
pointer n
ROM correction address
register (CORAH, CORAL)
Remark n = 0 to 3, m = 0, 1
CORENn CORCHm
Internal bus
ROM correction control register
(CORC)
Preliminary User’s Manual U13987EJ1V0UM00
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