User`s manual

ManualsBrandsRenesas ManualsComputer HardwareHS1653ECN61H

141

142

143

144

145

146

147

148

149

150

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 3.4 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.

3.5 Notes Specific to the H8SX/1544 E6000H Emulator

3.5.1 Custom Device Function

The maximum value selectable for the on-chip ROM with the custom device functions of the H8SX/1544

E6000H emulator is 2 Mbytes. Do not specify a value greater than 2 Mbytes.

3.5.2 Subclock Operation

This emulator does not support subclock operation. Thus the following function and register cannot be used:

• WAT

• Subclock control register (SUBCKCR)

3.5.3 Open-Drain Control Registers (PnODR) ⎯Restriction

In the emulator, the NMOS open-drain output is disabled regardless of the setting of the bits, while setting a bit

of PnODR corresponding to TIOCB4, TIOCA4, TIOCA5, TIOCB5, A23 to A16, TxD5, or SCK5 as 1 enables

an NMOS open-drain output in the actual MCU. Note, however, that P24 to P27 and PF0 to PF7 can be used as

NMOS open-drain outputs.

3.5.4 Synchronous Serial Communication Unit (SSU) ⎯Restriction

If a conflict error occurs while the values of bits MSS and SCKS in an SSCRH register are 1, the MSS bit will be

cleared and the corresponding SSCK pin will be switched to act as an input. After that, even if the user sets the

SCKS bit to 0 to reconfigure the SSCK pin to act as an I/O port pin, the emulator will not set the SSCK pin up as

an I/O port pin. To allow use of the SSCK pin as an I/O port pin, have the program write 0 to the MSS bit if a

conflict error occurs. This procedure is not necessary unless the SSCK pin is to be used as an I/O port pin.