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H8S, H8SX Family E10A-USB Emulator
Section 2 Specifications of the Emulator's Software
2.1
Differences between the H8S/2427, H8S/2427R, H8S/2425 Group and
the Emulator
1. When the emulator system is initiated, it initializes the general registers and part of the control
registers as shown in table 2.1. The initial value of the MCU is undefined. When the emulator
is initiated from the workspace, a value to be entered is saved in a session.
For the registers shown in table 2.1, values other than PC or CCR are not changed even if the
CPU reset command is issued. If ER7 (SP) is changed as an odd value, it must be modified in
the [Register] window.
Table 2.1 Register Initial Values at Emulator Power-On
Register
Initial Value
PC
Reset vector value in the vector address table
ER0 to ER6
H'0
ER7 (SP)
H'10
CCR
1 for I mask, and others undefined
EXR
H'7F
MACH
H'0
MACL
H'0
2. System Control Register
In the emulator, the internal I/O registers can be accessed from the [IO] window. However, be
careful when accessing the system control register. The emulator saves the register value of
the system control register at a break and returns the value when the user program is executed.
Since this is done during a break, do not rewrite the system control register in the [IO]
window.
3. Memory Access during Emulation
If the memory contents are referenced or modified during emulation, realtime emulation
cannot be performed because the user program is temporarily halted.
4. The emulator communicates with the MCU by using the on-chip emulator pins. The functions
multiplexed with the on-chip emulator pins cannot be used.
R20UT0271EJ0100 Rev. 1.00
May 13, 2011
Section 2 Specifications of the Emulator's Software
Page 9 of 20
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