參數(shù)資料
型號(hào)： 89C61X2
廠商： NXP Semiconductors N.V.
元件分類： 8位微控制器
英文描述： 80C51 8-bit Flash microcontroller family
中文描述： 80C51的8位閃存微控制器系列
文件頁(yè)數(shù)： 43/56頁(yè)
文件大小： 342K
代理商： 89C61X2
Philips Semiconductors
Product data
P89C60X2/61X2
80C51 8-bit Flash microcontroller family
64KB Flash, 512B/1024B RAM
2003 Sep 11
43
Expanded Data RAM Addressing
The P89C60X2 has internal data memory that is mapped into four
separate segments: the lower 128 bytes of RAM, upper 128 bytes of
RAM, 128 bytes Special Function Register (SFR), and 256 bytes
expanded RAM (ERAM) (768 bytes for the P89C61X2).
The four segments are:
1. The Lower 128 bytes of RAM (addresses 00H to 7FH) are
directly and indirectly addressable.
2. The Upper 128 bytes of RAM (addresses 80H to FFH) are
indirectly addressable only.
3. The Special Function Registers, SFRs, (addresses 80H to FFH)
are directly addressable only.
4. The 256/768-bytes expanded RAM (ERAM, 00H – 1FFH/2FFH)
are indirectly accessed by move external instruction, MOVX, and
with the EXTRAM bit cleared, see Figure 29.
The Lower 128 bytes can be accessed by either direct or indirect
addressing. The Upper 128 bytes can be accessed by indirect
addressing only. The Upper 128 bytes occupy the same address
space as the SFR. That means they have the same address, but are
physically separate from SFR space.
When an instruction accesses an internal location above address
7FH, the CPU knows whether the access is to the upper 128 bytes
of data RAM or to SFR space by the addressing mode used in the
instruction. Instructions that use direct addressing access SFR
space. For example:
MOV 0A0H,#data
accesses the SFR at location 0A0H (which is P2). Instructions that
use indirect addressing access the Upper 128 bytes of data RAM.
For example:
MOV @R0,acc
where R0 contains 0A0H, accesses the data byte at address 0A0H,
rather than P2 (whose address is 0A0H).
The ERAM can be accessed by indirect addressing, with EXTRAM
bit cleared and MOVX instructions. This part of memory is physically
located on-chip, logically occupies the first 256/768 bytes of external
data memory in the P89C60X2/61X2.
With EXTRAM = 0, the ERAM is indirectly addressed, using the
MOVX instruction in combination with any of the registers R0, R1 of
the selected bank or DPTR. An access to ERAM will not affect ports
P0, P3.6 (WR#) and P3.7 (RD#). P2 SFR is output during external
addressing. For example, with EXTRAM = 0,
MOVX @R0,acc
where R0 contains 0A0H, accesses the ERAM at address 0A0H
rather than external memory. An access to external data memory
locations higher than the ERAM will be performed with the MOVX
DPTR instructions in the same way as in the standard 80C51, so
with P0 and P2 as data/address bus, and P3.6 and P3.7 as write
and read timing signals. Refer to Figure 30.
With EXTRAM = 1, MOVX @Ri and MOVX @DPTR will be similar
to the standard 80C51. MOVX @ Ri will provide an 8-bit address
multiplexed with data on Port 0 and any output port pins can be
used to output higher order address bits. This is to provide the
external paging capability. MOVX @DPTR will generate a 16-bit
address. Port 2 outputs the high-order eight address bits (the
contents of DPH) while Port 0 multiplexes the low-order eight
address bits (DPL) with data. MOVX @Ri and MOVX @DPTR will
generate either read or write signals on P3.6 (WR) and P3.7 (RD).
The stack pointer (SP) may be located anywhere in the 256 bytes
RAM (lower and upper RAM) internal data memory. The stack may
not be located in the ERAM.
AUXR
Reset Value = xxxx xx00B
—
—
—
—
—
—
EXTRAM
AO
Not Bit Addressable
Bit:
Symbol
Function
AO
Disable/Enable ALE
AO
0
Operating Mode
ALE is emitted at a constant rate of
1
/
6
the oscillator frequency (12-clock mode;
1
/
3
f
OSC
in 6-clock mode).
ALE is active only during off-chip memory access.
Internal/External RAM access using MOVX @Ri/@DPTR
EXTRAM
Operating Mode
0
Internal ERAM access using MOVX @Ri/@DPTR
1
External data memory access.
Not implemented, reserved for future use*.
1
EXTRAM
—
NOTE:
*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value
of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU01613
7
6
5
4
3
2
1
0
Address = 8EH
Figure 29. AUXR: Auxiliary Register
相關(guān)PDF資料
PDF描述
8AGP1 Fast Blow Fuse Series
8T34HA Thyristor Product Catalog
90-030A Industrial Control IC
90-030G Industrial Control IC
90-030S Industrial Control IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
89C664HFA 制造商: 功能描述: 制造商:undefined 功能描述:
89-CBSAP-2.5X3.5X0.8 功能描述:89-CBSAP-2.5X3.5X0.8--89S14--CIR 制造商:leader tech inc. 系列:* 零件狀態(tài):在售 類型:屏蔽，分體式 高度 - 總:0.800"（20.32mm） 長(zhǎng)度 - 總:3.500"（88.90mm） 寬度 - 總:2.500"（63.50mm） 通風(fēng):通風(fēng)孔，按樣式排列 安裝類型:通孔 標(biāo)準(zhǔn)包裝:5
89-CBSFND-2.25X3.75X0.80 功能描述:89-CBSFND-2.25X3.75X0.80--89S35- 制造商:leader tech inc. 系列:* 零件狀態(tài):在售 類型:屏蔽，分體式 高度 - 總:0.800"（20.32mm） 長(zhǎng)度 - 總:3.750"（95.25mm） 寬度 - 總:2.250"（57.15mm） 通風(fēng):通風(fēng)孔，按樣式排列 安裝類型:通孔 標(biāo)準(zhǔn)包裝:20
89-CBSFNSV-2.0X7.0X0.8 功能描述:89-CBSFNSV-2.0X7.0X0.8--89S36--C 制造商:leader tech inc. 系列:* 零件狀態(tài):在售 類型:屏蔽，分體式 高度 - 總:0.800"（20.32mm） 長(zhǎng)度 - 總:7.000"（177.80mm） 寬度 - 總:2.000"（50.80mm） 通風(fēng):通風(fēng)孔，按樣式排列 安裝類型:通孔 標(biāo)準(zhǔn)包裝:20
89-CBSU-24" 功能描述:89-CBSU-24"--89S01--FLAT FENCE S 制造商:leader tech inc. 系列:* 零件狀態(tài):在售 類型:屏蔽，分體式 長(zhǎng)度 - 總:- 通風(fēng):通風(fēng)孔，按樣式排列 安裝類型:通孔 標(biāo)準(zhǔn)包裝:5
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*