Epson S1C33 Series Core Manual page 48

5 INSTRUCTION SET
When extended by two ext instructions
ext imm13
ext imm13'
Functions as "jp sign32"
jp sign8
The imm13 specified by the first ext instruction is effective for only 10 bits, from bit 12 to bit 3 (with the 3
low-order bits ignored), so that sign32 is configured as follows:
sign32 = {imm13[12:3], imm13', sign8, 0}
31
sign32 S imm13 [12:3]
PC
PC
The range of addresses to which jumped is (PC - 2,147,483,648) to (PC + 2,147,483,646).
The above range of addresses to which jumped is a theoretical value, and is actually limited by the range of
memory areas used.
For jpr branch
jpr %rb
A signed 32-bit relative value is specified for rb.
The jump address is configured as follows:
{rb[31:1], 0}
31
S
[%rb]
PC
PC
The least significant bit in the rb register is always handled as 0.
The range of addresses to which jumped is (PC - 2,147,483,648) to (PC + 2,147,483,646).
The above range of addresses to which jumped is a theoretical value, and is actually limited by the range of
memory areas used.
Branch conditions
The jp and jpr instructions are unconditional jump instructions that always cause the program to branch.
Instructions with names beginning with jr are conditional jump instructions for which the respective branch
conditions are set by a combination of flags, so that only when the conditions are satisfied do they cause the
program to branch to a specified address. The program does not branch unless the conditions are satisfied.
The conditional jump instructions basically use the result of the comparison of two values by the cmp
instruction to determine whether to branch. For this reason, the name of each instruction includes a character
that represents relative magnitude.
The types of conditional jump instructions and branch conditions are listed in Table 5.14.1.1.
Table 5.14.1.1 Conditional Jump Instructions and Branch Conditions
Instruction
Greater Than
jrgt
Greater or Equal
jrge
Less Than
jrlt
Less or Equal
jrle
Unsigned, Greater Than
jrugt
Unsigned, Greater or Equal
jruge
Unsigned, Less Than
jrult
Unsigned, Less or Equal
jrule
Equal
jreq
Not Equal
jrne
40
22 21
imm13'
+
Current address
Branch destination address
W[31:1]
+
Current address
Branch destination address
Flag condition Comparison of A:B
!Z & !(N ^ V)
!(N ^ V)
N ^ V
Z | (N ^ V)
!Z & !C
!C
C
Z | C
Z
!Z
Comparison of A:B made when "cmp A,B"
EPSON
9 8
sign8
Remark
A > B Used to compare
A ≥ B
signed data
A < B
A ≤ B
A > B Used to compare
A ≥ B
unsigned data
A < B
A ≤ B
A = B
A ≠ B
S1C33 FAMILY C33 PE CORE MANUAL
1 0
0
0
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1 0
X
0
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