28
•
High-speed operation
All frequently-used instructions execute in one or two states
Maximum clock rate
: 20 MHz
8/16/32-bit register-register add/subtract
: 50 ns
8
×
8-bit register-register multiply
: 150 ns
16 ÷ 8-bit register-register divide
: 600 ns
16
×
16-bit register-register multiply
: 200 ns
32 ÷ 16-bit register-register divide
: 1000 ns
•
Two CPU operating modes
Normal mode*
Advanced mode
Note: * Not available in the H8S/2646 Series.
•
Power-down state
Transition to power-down state by SLEEP instruction
CPU clock speed selection
2.1.2
Differences between H8S/2600 CPU and H8S/2000 CPU
The differences between the H8S/2600 CPU and the H8S/2000 CPU are as shown below.
•
Register configuration
The MAC register is supported only by the H8S/2600 CPU.
•
Basic instructions
The four instructions MAC, CLRMAC, LDMAC, and STMAC are supported only by the
H8S/2600 CPU.
•
Number of execution states
The number of execution states of the MULXU and MULXS instructions is different in each
CPU.
Execution States
Instruction
Mnemonic
H8S/2600
H8S/2000
MULXU
MULXU.B Rs, Rd
3
12
MULXU.W Rs, ERd
4
20
MULXS
MULXS.B Rs, Rd
4
13
MULXS.W Rs, ERd
5
21
Summary of Contents for H8S/2645
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Page 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
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