User`s manual

SuperH™ Family E10A-USB Emulator Section 2 Software Specifications when Using the Emulator

R20UT2188EJ0100 Rev. 1.00 Page 7 of 24

Aug 09, 2012

Section 2 Software Specifications when Using the Emulator

2.1 Differences between the SH72A2, SH72A0, 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 values of the MCU are undefined.

Table 2.1 Register Initial Values at Emulator Link Up

R0 to R14 H'00000000

R15 (SP) Value of the SP in the power-on reset vector table

PC Value of the PC in the power-on reset vector table

SR H'000000F0

GBR H'00000000

VBR H'00000000

TBR H'00000000

MACH H'00000000

MACL H'00000000

PR H'00000000

FPSCR* H'00040001

FPUL* H'00000000

FPR0-15* H'00000000

Note: If the MCU does not incorporate the floating-point unit (FPU), these registers are not

displayed.

Note: When a value of the interrupt mask bit in the SR register is changed in the [Registers]

window, it is actually reflected in that register immediately before execution of the user

program is started. It also applies when the value is changed by the REGISTER_SET

command.

2. The emulator uses the H-UDI; do not access the H-UDI.

3. Low-Power States

⎯ When the emulator is used, the sleep state can be cleared with either the clearing function

or with the [STOP] button, and a break will occur.

⎯ Before stopping the supply of a clock signal to the FPU, be sure to use the command-line

window to prohibit access to the FPU registers. Once this setting is made, H’FF is always

indicated as the read value of each of the FPU registers in the register window, and writing

becomes ineffective. For details, see [Help] -> [Emulator Help] -> [Command Line

Interface] -> [FPU_ACCESS] on the menu bar of the High-performance Embedded

Workshop.

4. Reset Signals

The MCU reset signals are only valid during emulation started with clicking the GO or STEP-

type button. If these signals are enabled on the user system in command input wait state, they

are not sent to the MCU.

Note: Do not break the user program when the /RES signal is being low. A TIMEOUT error

will occur.