Pokémon mini Development Documentation

JMP = Jump to routine

Hex	Mnemonic	Cycles	Condition
E4 dd	JRS C,dd	2	Carry=1
E5 dd	JRS NC,dd	2	Carry=0
E6 dd	JRS Z,dd	2	Zero=1
E7 dd	JRS NZ,dd	2	Zero=0
EC rr qq	JRL C,qqrr	3	Carry=1
ED rr qq	JRL NC,qqrr	3	Carry=0
EE rr qq	JRL Z,qqrr	3	Zero=1
EF rr qq	JRL NZ,qqrr	3	Zero=0
F1 dd	JRS dd	2	n/a
F3 rr qq	JRL qqrr	3	n/a
F4	JP HL	2	n/a
F5 dd	DJR NZ,dd	4	B != 0x00, decrement B before check
FD kk	JP [kk]	2	n/a
CE E0 dd	JRS LT,dd	3	(Overflow=1) != (Negative=1)
CE E1 dd	JRS LE,dd	3	((Overflow=0) != (Negative=0)) OR (Zero=1)
CE E2 dd	JRS GT,dd	3	((Overflow=1) == (Negative=1)) AND (Zero=0)
CE E3 dd	JRS GE,dd	3	(Overflow=0) == (Negative=0)
CE E4 dd	JRS V,dd	3	Overflow=1
CE E5 dd	JRS NV,dd	3	Overflow=0
CE E6 dd	JRS P,dd	3	Negative=0
CE E7 dd	JRS M,dd	3	Negative=1
CE E8 dd	JRS F0,dd	3	F0=1*
CE E9 dd	JRS F1,dd	3	F1=1 (unused flag)
CE EA dd	JRS F2,dd	3	F2=1 (unused flag)
CE EB dd	JRS F3,dd	3	F3=1 (unused flag)
CE EC dd	JRS NF0,dd	3	F0=0*
CE ED dd	JRS NF1,dd	3	F1=0 (unused flag)
CE EE dd	JRS NF2,dd	3	F2=0 (unused flag)
CE EF dd	JRS NF3,dd	3	F3=0 (unused flag)

* F0 is set on the Pokémon Channel emulator when the previous DIV had a denominator of 0.

Execute

kk     = Lower 8 bits of a vector address
dd     = Immediate signed 8-bits
qqrr   = Immediate signed 16-bits
B      = Register B
NB/CB  = Register NB or CB
HL     = Register HL: (H shl 8) or L
SP     = Register SP (Stack Pointer)
PC     = Register PC (Program Counter)
[hhll] = Memory: (EP shl 16) or hhll

Conditional JRS

; JRS *,dd

IF (Condition) THEN
  CB = NB
  PC = PC + dd - 1
ENDIF

Conditional JRL

; JRL *,ddss

IF (Condition) THEN
  CB = NB
  PC = PC + ddss - 1
ENDIF

JRS

; JRS dd

CB = NB
PC = PC + dd - 1

JRL

; JRL ddss

CB = NB
PC = PC + ddss - 1

JP

; JP HL

CB = NB
PC = HL

; JP \[kk] (not fully tested)

CB = NB
PC = Memory16[kk SLL 1]

DJR

; DJR NZ,dd

B = B - 1
IF (B <> 0) THEN
  CB = NB
  PC = PC + dd - 1
ENDIF

Description

Jump into a new position of the program.

NOTE: All non-branch instructions do “NB = CB” causing NB to be restored, any branch that requires banking needs “LD NB, A” or “LD NB, #nn” directly before any jump.

Conditions

0xF5 - DJR NZ,dd

• Zero: Set when result is 0

Carry, Overflow, and Sign remain unchanged

All others:

None

Examples

; A = 0x10
CP A, 0x10  ; Compare A with 0x10`
; SC = (Zero=1):(Carry=0):(Overflow=0):(Negative=0)
JZ val_is_16
LD A, 0x00
val_is_16:
; A = 0x10

; Jump into a label located at a different bank
LD NB, $0F
JMP function_at_bank_15

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