Intel 8253 - Page 517

4/17/98 6-117 Addressing Modes and Data Types
MOV direct, direct
Bytes: 4
Clocks: 4
Operation: (direct) <-- (direct)
Encoding:
byte 3: lower 8 bits of direct (dest)
byte 4: lower 8 bits of direct (src)
MOV Rd, USP (move from user stack pointer)
Bytes: 2
Clocks: 3
Operation: (Rd) <-- (USP)
Encoding:
MOV USP, Rs (move to user stack pointer)
Bytes: 2
Clocks: 3
Operation: (USP) <-- (Rs)
Encoding:
1 0 0 1 SZ 1 1 1 0 d dir: 3 bits 0 s dir: 3 bits
1 0 0 1 0 0 0 0 d d d d 1 1 1 1
1 0 0 1 1 0 0 0 s s s s 1 1 1 1