AT80C51RD2-RLRUM データシートの表示（PDF） - Atmel Corporation
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AT80C51RD2-RLRUM Datasheet PDF : 83 Pages
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Table 1. Memory Size
TOTAL RAM
ROM (Bytes)
XRAM (Bytes)
(Bytes)
I/O
AT83C51RB2
16K
1024
1280
32
AT83C51RC2
32K
1024
1280
32
AT80C51RD2
ROMless
1024
1280
32
Block Diagram
XTAL1
XTAL2
ALE/PROG
PSEN
EA
RD (2)
WR (2)
(2) (2)
(1) (1) (1) (1)
EUART
+
BRG
RAM
256x8
ROM
32Kx8 or
16Kx8
XRAM
1Kx8
CPU
C51
CORE
IB-bus
PCA
Timer2
Timer 0 INT
Timer 1 Ctrl
Parallel I/O Ports & Ext. Bus
Port 0Port 1 Port 2 Port 3
Watch
Dog
Key
Board
(2) (2) (2) (2)
Notes: 1. Alternate function of Port 1
2. Alternate function of Port 3
2 AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
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