Samsung KS57C2308 manual Memory MAP, MAP for Hardware Registers

KS57C2308/P2308/C2316/P2316 MEMORY MAP

4 MEMORY MAP

OVERVIEW

To support program control of peripheral hardware, I/O addresses for peripherals are memory-mapped to bank 15 of the RAM. Memory mapping lets you use a mnemonic as the operand of an instruction in place of the specific memory location.

Access to bank 15 is controlled by the select memory bank (SMB) instruction and by the enable memory bank flag (EMB) setting. If the EMB flag is "0", bank 15 can be addressed using direct addressing, regardless of the current SMB value. 1-bit direct and indirect addressing can be used for specific locations in bank 15, regardless of the current EMB value.

I/O MAP FOR HARDWARE REGISTERS

Table 4-1 contains detailed information about I/O mapping for peripheral hardware in bank 15 (register locations F80H–FFFH). Use the I/O map as a quick-reference source when writing application programs. The I/O map gives you the following information:

—Register address

—Register name (mnemonic for program addressing)

—Bit values (both addressable and non-manipulable)

—Read-only, write-only, or read and write addressability

—1-bit, 4-bit, or 8-bit data manipulation characteristics

4-1