Area 10 - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

II CORE BLOCK: BCU (Bus Control Unit)

Area 10

Area 10 is an external memory area that includes the boot address (0xC00000). This area supports two boot modes.
Note: Internal ROM is not provided in the S1C33L03.
Area 10 boot mode
The boot mode can be configured using the external pins EA10MD[1:0].
Internal ROM boot mode
The CPU boots by the internal ROM mapped to area 10. The internal ROM size should be selected from
among eight types (min. 16 KB, max. 2 MB) using the A10IR[2:0] (D[E:C])/Areas 10–9 set-up register
(0x48126). This ROM begins with address 0xC00000 and can be read in one cycle the same as that of area 3.
For the remained area within area 10, the external memory will be accessed if it is available.
External ROM boot mode
The CPU boots by the external ROM (ROM, Flash, SRAM, etc.). This mode uses the bus condition set by the
BCU registers for area 10.
Setting the internal ROM size
When a boot mode other than external ROM boot mode is used, the internal ROM or emulation memory size
should be set using A10IR[2:0] (D[E:C)/Areas 10–9 set-up register (0x48126).
B-II-4-8
Table 4.6 Area 10 Boot Mode Selection
EA10MD[1:0] pins
10 Internal ROM boot mode
11 External ROM boot mode
Table 4.7 Area 10 Internal ROM Size
A10IR2 A10IR1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
Area 10 boot mode
A10IR0 ROM size
0 16 KB
1 32 KB
0 64 KB
1 128 KB
0 256 KB
1 512 KB
0 1 MB
1 2 MB (default)
EPSON
S1C33L03 FUNCTION PART