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參數(shù)資料
| 型號： | UPD78324GJ |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 16/8-BIT單片機(jī) |
| 文件頁數(shù)： | 29/86頁 |
| 文件大?。?/td> | 454K |
| 代理商： | UPD78324GJ |
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29
μ
PD78323, 78324
2.3.1
General Register Addressing
The general registers consist of eight register banks, each consisting of sixteen 8-bit registers or eight 16-bit registers.
General register addressing is carried out using the register specify field of 3 or 4 bits supplied from an instruction word,
the register bank select flag (RBS0 to RBS2) and the register set select flag (RSS) in the PSW.
2.3.2
Short Direct Addressing
Short direct addressing which enables direct address specification by 1-byte data in an instruction work is applied to the
FE20H to FF1FH space. The short direct memory is accessed as 8-bit or 16-bit data. When accessing the memory as 16-
bit data, specification of even data for 1-byte address specify data will cause 2-byte data specified by continuous addresses
of even and odd addresses to be accessed. (Do not specify odd number for address specify data.)
2.3.3
Special Function Register (SFR) Addressing
This addressing is applied to operations for the special function register (SFR) mapped in the SFR area of FF00H to
FFFFH. Addressing is performed by 1-byte data in the instruction word corresponding to the lower 8 bits of the special
function register address. For 16-bit access of 16-bit operational SFR, 2-byte data specified by continuous even and odd
addresses is accessed as is the case with short direct addressing.
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