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參數資料
| 型號： | DS89C420 |
| 英文描述： | Ultra-High-Speed Microcontroller |
| 中文描述： | 超高速微控制器 |
| 文件頁數： | 21/59頁 |
| 文件大小： | 539K |
| 代理商： | DS89C420 |
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DS89C420
21 of 59
On-Chip MOVX Data Memory
On-chip data memory is provided by the 1kB SRAM and occupies addresses 0000h through 03FFh. The
internal data memory is disabled after a power-on reset, and any MOVX instruction directs the data
memory access to the external data memory. To enable the internal data memory, software must
configure the data memory enable bits DME1 and DME0 (PMR.1-0). See “SFR Bit Descriptions” in the
Ultra-High-Speed Flash Microcontroller User’s Guide
for data memory configurations. Once enabled,
MOVX instructions with addresses inside the 1k range access the on-chip data memory, and addresses
exceeding the 1k range automatically access external data memory.
An internal data memory cycle spans only one system clock period to support fast internal execution.
Data Pointer Increment/Decrement and Options
The DS89C420 incorporates a hardware feature to assist applications that require data pointer
increment/decrement. Data pointer increment/decrement bits ID0 and ID1 (DPS.6 and DPS.7) define how
the INC DPTR instruction functions in relation to the active DPTR (selected by the SEL bit). Setting
ID0 = 1 and SEL = 0 enables the decrement operation for DPTR, and execution of the INC DPTR
instruction decrements the DPTR contents by 1. Similarly, setting ID1 = 1 and SEL = 1 enables the
decrement operation for DPTR1, and execution of the INC DPTR instruction decrements the DPTR1
contents by 1. With this feature, the user can configure the data pointers to operate in four ways for the
INC DPTR instruction:
ID1
0
ID0
0
SEL = 0
SEL = 1
Increment DPTR
Increment DPTR1
0
1
Decrement DPTR
Increment DPTR1
1
0
Increment DPTR
Decrement DPTR1
1
1
Decrement DPTR
Decrement DPTR1
The active data pointer is always selected by the SEL (DPS.0) bit. The DS89C420 offers a programmable
option that allows any instructions related to data pointer to toggle the SEL bit automatically. This option
is enabled by setting the toggle-select-enable bit (TSL-DPS.5) to a logic 1. Once enabled, the SEL bit is
automatically toggled after the execution of one of the following five DPTR-related instructions:
INC DPTR
MOV DPTR #data16
MOVC A, @A+DPTR
MOVX A, @DPTR
MOVX @DPTR, A
The DS89C420 also offers a programmable option that automatically increases (or decreases) the
contents of the selected data pointer by 1 after the execution of a DPTR-related instruction. The actual
function (increment or decrement) is dependent upon the setting of the ID1 and ID0 bits. This option is
enabled by setting the automatic increment/decrement enable (AID-DPS.4) to a logic 1 and is affected by
one of the following three instructions:
MOVC A, @A+DPTR
MOVX A, @DPTR
MOVX @DPTR, A
相關PDF資料 |
PDF描述 |
|---|---|
| DS89C420-ECL | Ultra-High-Speed Microcontroller |
| DS89C420-MCL | Ultra-High-Speed Microcontroller |
| DS9094 | iButtonTM Clip |
| DS9097 | COM Port Adapter |
| DS9097E | COM Port Adapter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS89C420_02 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller |
| DS89C420_05 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller |
| DS89C420-ECL | 功能描述:IC MCU ULTRA 33MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設備:LED，POR，WDT 輸入/輸出數:9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| DS89C420-ECS | 功能描述:IC MCU 50MHZ ULTRA HS 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設備:LED，POR，WDT 輸入/輸出數:9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| DS89C420-ENG | 功能描述:IC MCU ULTRA 25MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設備:LED，POR，WDT 輸入/輸出數:9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
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