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| 型号： | 89C52 |
| 厂商： | Integrated Silicon Solution, Inc. |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| 中文描述： | CMOS单芯片的8位单片机，带有8的快闪记忆体 |
| 文件页数： | 7/50页 |
| 文件大小： | 425K |
| 代理商： | 89C52 |
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IS89C52
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
7
ISSI
OPERATING DESCRIPTION
The detail description of the IS89C52 included in this
description are:
Memory Map and Registers
Timer/Counters
Serial Interface
Interrupt System
Other Information
Flash Memory
MEMORY MAP AND REGISTERS
Memory
The IS89C52 has separate address spaces for program
and data memory. The program and data memory can be
up to 64K bytes long. The lower 8K program memory can
reside on-chip. Figure 5 shows a map of the IS89C52
program and data memory.
The IS89C52 has 256 bytes of on-chip RAM, plus numbers
of special function registers. The lower 128 bytes can be
accessed either by direct addressing or by indirect
addressing. Figure 6 shows internal data memory
organization and SFR Memory Map.
The lower 128 bytes of RAM can be divided into three
segments as listed below and shown in Figure 7.
1.
Register Banks 0-3:
locations 00H through 1FH (32
bytes). The device after reset defaults to register bank
0. To use the other register banks, the user must select
them in software. Each register bank contains eight
1-byte registers R0-R7. Reset initializes the stack
point to location 07H, and is incremented once to start
from 08H, which is the first register of the second
register bank.
2.
Bit Addressable Area:
16 bytes have been assigned
for this segment 20H-2FH. Each one of the 128 bits of
this segment can be directly addressed (0-7FH). Each
of the 16 bytes in this segment can also be addressed
as a byte.
3.
Scratch Pad Area:
30H-7FH are available to the user
as data RAM. However, if the data pointer has been
initialized to this area, enough bytes should be left
aside to prevent SP data destruction.
FFFFH:
64K
1FFFH:
8K
Program Memory
(Read Only)
Data Memory
(Read/Write)
EA = 0
External
PSEN
EA = 1
Internal
0000
00
FFFFH:
External
Internal
FFH:
0000
RD WR
Figure 5. IS89C52 Program and Data Memory Structure
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