RF5C164 Notes

$1FFFH ~ $1000H: Wave data area
$0FFFH ~ $0020H: Not used (Impossible to access)
$001FH: WAVE RAM ADDRESS 8CH. HIGH
$001EH: WAVE RAM ADDRESS 8CH. LOW
$001DH: WAVE RAM ADDRESS 7CH. HIGH
$001CH: WAVE RAM ADDRESS 7CH. LOW
$001BH: WAVE RAM ADDRESS 6CH. HIGH
$001AH: WAVE RAM ADDRESS 6CH. LOW
$0019H: WAVE RAM ADDRESS 5CH. HIGH
$0018H: WAVE RAM ADDRESS 5CH. LOW
$0017H: WAVE RAM ADDRESS 4CH. HIGH
$0016H: WAVE RAM ADDRESS 4CH. LOW
$0015H: WAVE RAM ADDRESS 3CH. HIGH
$0014H: WAVE RAM ADDRESS 3CH. LOW
$0013H: WAVE RAM ADDRESS 2CH. HIGH
$0012H: WAVE RAM ADDRESS 2CH. LOW
$0011H: WAVE RAM ADDRESS 1CH. HIGH
$0010H: WAVE RAM ADDRESS 1CH. LOW
$000FH ~ $0009H: Not Used (Impossible to access)
$0008H: Sound ON/OFF register
$0007H: Control Register
$0006H: ST data memory
$0005H: LSH data memory
$0004H: LSL data memory
$0003H: FDH data memory
$0002H: FDL data memory
$0001H: PAN data memory
$0000H: ENV data memory

Notes: $0000H to $0007H are used as write only registers, and selected by using the bank function of the control register.
$0010H to $001FH are used as read only registers.

(Copied from the manual to be more readable)