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Section 21 128kB PROM
21.1
Overview
This LSI has 128 kbytes of on-chip PROM.The on-chip ROM is connected to the CPU, the direct
memory access controller (DMAC) and the data transfer controller (DTC) through a 32-bit data
bus (figures 21.1). The CPU, DMAC, and DTC can access the on-chip ROM in 8, 16, and 32-bit
widths. Data in the on-chip ROM can always be accessed in one cycle.
H'00000000
H'00000004
H'00000001
H'00000005
H'00000002
H'00000006
H'00000003
H'00000007
H'0001FFFC
H'0001FFFD
H'0001FFFE
H'0001FFFF
On-chip ROM
Internal data bus (32 bits)
Figure 21.1 PROM Block Diagram
The operating mode determines whether the on-chip ROM is valid or not. The operating mode is
selected using mode-setting pins MD3–MD0 as shown in table 21.1. If you are using the on-chip
ROM, select mode 2 or mode 3; if you are not, select mode 0 or 1. The on-chip ROM is allocated
to addresses H'00000000–H'0001FFFF of memory area 0.
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