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].

Table 4.6 Area 10 Boot Mode Selection

EA10MD[1:0] pins

Area 10 boot mode

10Internal ROM boot mode

11External ROM boot mode

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).

Table 4.7 Area 10 Internal ROM Size

A10IR2

A10IR1

A10IR0

ROM size

0

0

0

16 KB

0

0

1

32 KB

0

1

0

64 KB

0

1

1

128 KB

1

0

0

256 KB

1

0

1

512 KB

1

1

0

1 MB

1

1

1

2 MB (default)

B-II-4-8

EPSON

S1C33L03 FUNCTION PART