t89c51rd2-slscl ATMEL Corporation, t89c51rd2-slscl Datasheet - Page 75

• Manufacturer Part Number: t89c51rd2-slscl
• Description: 0 To 40 Mhz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

Flash Parallel
Programming
Signature Bytes
Set-up modes Configuration
Definition of Terms
4243G–8051–05/03
Four hardware read only registers have to be accessed with parallel static test modes
(mode TMS) in order to control the Flash parallel programmimg:
•
•
•
•
As these registers can only be accessed by hardware, they must be read by the parallel
programmers and then copied in the XAF in order to make their values accessible by
software (ISP or API).
In order to program and verify the Flash or to read the signature bytes, the T89C51RD2
is placed in specific set-up modes. (See Figure 31.)
Figure 31. Set-Up Modes Configuration
Address Lines:P1.0-P1.7, P2.0-P2.5, P3.4-P3.5, respectively for A0-A15.
Data Lines:P0.0-P0.7 for D0-D7
Control Signals:RST, PSEN, P2.6, P2.7, P3.2, P3.3, P3.6, P3.7.
Program Signals: ALE/PROG, EA
Manufacturer code
Device ID # 1: Family code
Device ID # 2: Memories size and type
Device ID # 3: Name and revision
PROGRAM
SIGNALS*
CONTROL
SIGNALS*
4 to 6 MHz
EA
ALE/PROG
RST
PSEN
P2.6
P2.7
P3.3
P3.6
P3.7
XTAL1
V
P0.0-P0.7
P1.0-P1.7
CC
P3.5
P2.0-P2.5
P3.4
VSS
GND
+5V
D0-D7
A0-A7
A8-A13
A14
A15
T89C51RD2
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