11.8.3 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

Bit 2322212019181716 
    TOSU[4:0] 
Access R/WR/WR/WR/WR/W 
Reset 00000 
Bit 15141312111098 
 TOSH[7:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 
Bit 76543210 
 TOSL[7:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00000000 

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

Bits [21:17] of the TOS

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

Bits [16:8] of the TOS

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

Bits [7:0] of the TOS