KS57C2308/P2308/C2316/P2316 MEMORY MAP
4-1
4MEMORY 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