TOS

Top-Of-Stack Registers.

Contents of the stack pointed to by the STKPTR register. This is the value that will be loaded into the Program Counter upon a RETURN or RETFIE instruction.

Name:
TOS
Address:
0xFFD
Reset:
Access:
Bit2322212019181716
TOSU[4:0]
AccessR/WR/WR/WR/WR/W
Reset00000
Bit15141312111098
TOSH[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000
Bit76543210
TOSL[7:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Reset00000000

Bits 20:16 – TOSU[4:0]: Upper byte of TOS register

Upper byte of TOS register

Bits <21:17> of the TOS

Bits 15:8 – TOSH[7:0]: High Byte of the TOS Register

High Byte of the TOS Register

Bits <16:8> of the TOS

Bits 7:0 – TOSL[7:0]: Low Byte TOS Register

Low Byte TOS Register

Bits <7:0> of the TOS