4/17/98 6-143 Addressing Modes and Data Types
PUSH Push
PUSHU Push User
Syntax: PUSH src
PUSHU src
Description: The specified directly addressed data is pushed onto the stack. The data size may be
byte or word. PUSH uses the current stack pointer, while PUSHU forces an access to the user stack.
Size: Byte, Word
Flags Updated: none
PUSH direct
Bytes: 3
Clocks: 5
Operation: (SP) <-- (SP) - 2
((SP)) <-- (direct)
Encoding:
byte 3: 8 bits of direct
PUSHU direct
Bytes: 3
Clocks: 5
Operation: (USP) <-- (USP) - 2
((USP)) <-- (direct)
Encoding:
byte 3: 8 bits of direct
1 0 0 0 SZ 1 1 1
0 0 1 1 0 direct: 3 bits
1 0 0 0 SZ 1 1 1
0 0 1 0 0 direct: 3 bits
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