Samsung C8278X ユーザーズマニュアル

4-1 

In this chapter, detailed descriptions of the S3C8275X/C8278X/C8274X control registers are presented in an 
easy-to-read format. You can use this chapter as a quick-reference source when writing application programs. 
Figure 4-1 illustrates the important features of the standard register description format. 

Control register descriptions are arranged in alphabetical order according to register mnemonic. More detailed 
information about control registers is presented in the context of the specific peripheral hardware descriptions in 
Part II of this manual. 

Data and counter registers are not described in detail in this reference chapter. More information about all of the 
registers used by a specific peripheral is presented in the corresponding peripheral descriptions in Part II of this 
manual. 

The locations and read/write characteristics of all mapped registers in the S3C8275X/C8278X/C8274X register 
file are listed in Table 4-1. The hardware reset value for each mapped register is described in Chapter 8, "RESET 
and Power-Down." 

Locations D0H – D2H are not mapped. 

Basic timer control register 

BTCON 

211 

D3H 

R/W 

System clock control register CLKCON 

212 

D4H 

R/W 

System flags register 

FLAGS 

213 

D5H 

R/W 

Register pointer 0 

RP0 

214 

D6H 

R/W 

Register pointer 1 

RP1 

215 

D7H 

R/W 

Stack pointer (high byte) 

SPH 

216 

D8H 

R/W 

Stack pointer (low byte) 

SPL 

217 

D9H 

R/W 

Instruction pointer (high byte) 

IPH 

218 

DAH 

R/W 

Instruction pointer (low byte) 

IPL 

219 

DBH 

R/W 

Interrupt request register 

IRQ 

220 

DCH 

R 

Interrupt mask register 

IMR 

221 

DDH 

R/W 

System mode register 

SYM 

222 

DEH 

R/W 

Register page pointer 

PP 

223 

DFH 

R/W