CHAPTER 15 RESET FUNCTION
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User’s Manual U14492EJ3V0UD
15.3 Initialization
Initialize the contents of each register as needed within a program.
Table 15-2 shows the initial values of the CPU, internal RAM, and on-chip peripheral I/O after reset.
Table 15-2. Initial Values of CPU, Internal RAM, and On-Chip Peripheral I/O After Reset (1/6)
On-Chip Hardware
Register Name
Initial Value After Reset
General-purpose register (r0)
00000000H
General-purpose registers (r1 to r31)
Undefined
Program registers
Program counter (PC)
00000000H
Status saving register during interrupt (EIPC, EIPSW)
Undefined
Status saving register during NMI (FEPC, FEPSW)
Undefined
Interrupt source register (ECR)
00000000H
Program status word (PSW)
00000020H
Status saving register during CALLT execution (CTPC, CTPSW)
Undefined
Status saving register during exception/debug trap (DBPC, DBPSW)
Undefined
CPU
System registers
CALLT base pointer (CTBP)
Undefined
Internal RAM
−
Undefined
Chip area selection control register n (CSCn) (n = 0, 1)
2C11H
Peripheral area selection control register (BPC)
0000H
Bus size configuration register (BSC)
0000H/5555H
Bus control
function
System wait control register (VSWC)
77H
Bus cycle type configuration register n (BCTn) (n = 0, 1)
CCCCH
Data wait control register n (DWCn) (n = 0, 1)
3333H
Address wait control register (AWC)
0000H
Memory control
function
Bus cycle control register (BCC)
AAAAH
DMA source address register nL (DSAnL) (n = 0 to 3)
Undefined
DMA source address register nH (DSAnH) (n = 0 to 3)
Undefined
DMA destination address register nL (DDAnL) (n = 0 to 3)
Undefined
DMA destination address register nH (DDAnH) (n = 0 to 3)
Undefined
DMA transfer count register n (DBCn) (n = 0 to 3)
Undefined
DMA addressing control register n (DADCn) (n = 0 to 3)
0000H
DMA channel control register n (DCHCn) (n = 0 to 3)
00H
DMA disable status register (DDIS)
00H
DMA restart register (DRST)
00H
DMA function
DMA trigger factor register n (DTFRn) (n = 0 to 3)
00H
In-service priority register (ISPR)
00H
External interrupt mode register n (INTMn) (n = 0 to 2)
00H
Interrupt mask register n (IMRn) (n = 0 to 3)
FFFFH
Interrupt mask register nL (IMRnL) (n = 0 to 3)
FFH
On-chip
peripheral
I/O
Interrupt/exception
control function
Interrupt mask register nH (IMRnH) (n = 0 to 3)
FFH
Содержание V850E/IA1 mPD703116
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