參數(shù)資料
型號(hào): UPD78F9211CS-CAB-A
廠商: Renesas Electronics America
文件頁數(shù): 125/175頁
文件大?。?/td> 0K
描述: MCU 8BIT 2KB FLASH 16PIN
標(biāo)準(zhǔn)包裝: 400
系列: 78K0S/Kx1+
核心處理器: 78K0S
芯體尺寸: 8-位
速度: 10MHz
外圍設(shè)備: LVD,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲(chǔ)器容量: 2KB(2K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 托盤
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16994EJ6V0UD
51
3.4.2 Short direct addressing
[Function]
The memory to be manipulated in the fixed space is directly addressed with the 8-bit data in an instruction word.
The fixed space where this addressing is applied is the 160-byte space FE80H to FF1FH (FE80H to FEFFH
(internal high-speed RAM) + FF00H to FF1FH (special function registers)).
The SFR area where short direct addressing is applied (FF00H to FF1FH) is a part of the total SFR area. In this
area, ports which are frequently accessed in a program and a compare register of the timer counter are mapped,
and these SFRs can be manipulated with a small number of bytes and clocks.
When 8-bit immediate data is at 80H to FFH, bit 8 of an effective address is cleared to 0. When it is at 00H to
1FH, bit 8 is set to 1. See [Illustration] below.
Identifier
Description
saddr
Label or FE80H to FF1FH immediate data
saddrp
Label or FE80H to FF1FH immediate data (even address only)
[Description example]
EQU DATA1 0FE90H ; DATA1 shows FE90H of a saddr area,
MOV DATA1, #50H
; When setting the immediate data to 50H
Instruction code
1
0
1
0
1
OP code
1
0
1
0
90H (saddr-offset)
0
1
0
1
0
50H (immediate data)
[Illustration]
15
0
Short direct memory
Effective
address
1
111111
8
0
7
OP code
saddr-offset
α
When 8-bit immediate data is 20H to FFH,
= 0.
When 8-bit immediate data is 00H to 1FH,
= 1.
α
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