User`s manual

3.4.8 Differences in Values of Registers

Note that certain general and control registers of both emulators are initialized whenever the system is activated

or the MCU is reset by a command.

Table 3.5 Initial Values of Registers in the MCU and the Emulator

Emulator

Power On

Reset (Reset CPU)

MCU

(Power-On Reset)

PC PC value indicated by

the power-on reset

vector

PC value indicated by

the power-on reset

vector

Undefined

ER0 to ER7 H'00000000 Value before the reset Undefined

CCR B’1XXXXXXX B’1XXXXXXX B’1XXXXXXX

EXR B’01111111 Value before the reset B’01111111

MACH H'00000000 Value before the reset Undefined

MACL H'00000000 Value before the reset Undefined

VBR H'00000000 Value before the reset H'00000000

SBR H'FFFFFF00 Value before the reset H'FFFFFF00

Note: X indicates an undefined bit.

3.4.9 Differences in Access to the Internal RAM

In the H8SX/1527 E6000H and H8SX/1527R E6000H emulators, writing to the internal RAM takes one cycle

by default. To make the emulator write data to the RAM in two cycles, the user program must write the value

H’35 to address H’FFFFFD97 before any RAM access. After that, the RAM should not be accessed for at least

one cycle. This address will be reinitialized whenever the reset pin is activated (goes low). In such cases, write

the value H’35 to the same address again after the system has been released from the reset state.

In the actual MCU (H8SX/1527 or H8SX/1527R), writing to the RAM takes a fixed two cycles and H’35 is

always read from address H’FFFFFD97. Writing to the address is invalid.