Renesas RZB-ZMD16C-ZDK Register Operation Limitations, Limitations on Register Operation

Applications Engineering

00000h

00400h

023FFh

0F000h

0F800h

10000h

SFR Area

Internal RAM

Area - 8kB

Reserved

High E/W

2kB data block

High E/W

2kB data block

	00400h
User RAM Area
= 8064 Bytes	0237Fh
Kernel RAM	02380h
(128 Bytes)	023FFh

Note: User programs must not use shaded areas.

E8000h

FFFFFh

Reserved

User

Flash ROM

Area - 96kB

FF900h

FFE80h

User Program

Area - 94kB

Kernel

Program

FFFDCh

Special Page

Area

Fixed Vector

Area

Figure 7-1: M30280FAHP Memory Map with the Kernel Program

Note: The kernel occupies memory associated with special-page vector numbers 18-19 and 192-255. The user reset vector is re-mapped to address FFFD8h by the kernel.

7.4. Register Operation Limitations

Table 6-2 lists the limitations on register operation. The registers are inhibited from any modification. If register contents are modified in any way, kernel operation cannot be guaranteed.

Table 7-2: Limitations on Register Operation

Register Name	Restriction
User and Interrupt Stack Pointers	RAM memory range 02380H – 023FFH is used
	by the kernel. Do not set stacks in this area.
UART1 Transmit/Receive Mode Register	Do not change.
UART1 Transmit/Receive Control Register 0
UART1 Transmit/Receive Control Register 1
UART1 Interrupt Control Register 0	Do not change.
UART Transmit/Receive Control Register 2	Do not change bits 0 and 2.
UART1 Transmit Buffer Register	Do not write to this register.
UART1 Receive Buffer Register	Do not read this register.
Port 6 and Port 6 DDR	To prevent changes on P6_4 data and direction,
	use read-modify-write only instructions (BSET,
	BCLR, AND, OR, etc.).

7.5. Limitations on Interrupts - Vectors that Reside in the Hardware Vector Table

Table 7-3lists the limitations on hardware interrupt (i.e. fixed) vector addresses.

RZB-ZMD16C-ZDK User’s Manual Rev 1.2 18/ 33 August 2006