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參數(shù)資料
| 型號： | P83C851FBA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS single-chip 8-bit microcontroller with on-chip EEPROM |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MO-047AC, SOT-187-2, LCC-44 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大小： | 182K |
| 代理商： | P83C851FBA |
Philips Semiconductors
Product specification
80C851/83C851
CMOS single-chip 8-bit microcontroller
with on-chip EEPROM
1998 Jul 03
7
EEPROM
Communications between the CPU and the
EEPROM is accomplished via 5 special
function registers; 2 address registers (high
and low byte), 1 data register for read and
write operations, 1 control register, and 1
timer register to adapt the erase/write time to
the clock frequency. All registers can be read
and written. Figure 1 shows a block diagram
of the CPU, the EEPROM and the interface.
Register and Functional
Description
Address Register (EADRH, EADRL)
The lower byte contains the address of one
of the 256 bytes. The higher byte (EADRH) is
for future extensions and for addressing the
security bits (see Security Facilities). The
EADRH register address is F3H. The EADRL
register address is F2H.
Data Register (EDAT)
This register is required for read and write
operations and also for row/block erase. In
write mode, its contents are written to the
addressed byte (for “row erase” and “block
erase” the contents are don’t care). The write
pulse starts all operations, except read. In
read mode, EDAT contains the data of the
addressed byte. The EDAT register address
is F4H.
Timer Register (ETIM)
The timer register is required to adapt the
erase/write time to the oscillator frequency.
The user has to ensure that the erase or
write (program) time is neither too short or
too long.
The ETIM register address is F5H. Table 2
contains the values which must be written to
the ETIM register by software for various
oscillator frequencies (the default value is
08H after RESET).
The general formula is:
2ms Write time:
Value (decimal,
to be rounded up)
f
XTAL1
[kHz]
512
2
10ms Write time:
f
XTAL1
[kHz]
96
2
Value (decimal)
Control Register (ECNTRL)
See Figure 2 for a description of this register.
The ECNTRL register address is F6H.
Table 2.
Values for the Timer Register (ETIM)
VALUES FOR ETIM
f
XTAL1
2ms WRITE TIME
HEX
10ms WRITE TIME
HEX
DEC
DEC
1.0MHz
2.0MHz
3.0MHz
4.0MHz
5.0MHz
6.0MHz
7.0MHz
8.0MHz
9.0MHz
10.0MHz
11.0MHz
12.0MHz
13.0MHz
14.0MHz
15.0MHz
16.0MHz
–
–
2
4
6
8
08
13
1D
28
32
3C
47
51
5C
66
71
7B
8
02
04
06
08
0A
0C
0E
10
12
14
16
18
1A
1C
1E
19
29
40
50
60
71
81
92
102
113
123
10
12
14
16
18
20
22
24
26
28
30
.
.
24.0MHz
2C
4745
Figure 1. EEPROM Interface Block Diagram
CPU
SEQUENCER
ECNTRL
CLOCK
GENERATOR
ETIM
CONTROL
LOGIC
COLUMN
DECODER
MATRIX
ROW
DECODER
EDATA
EADRH
EADRL
INTERNAL BUS
INTERRUPT
POWER-DOWN IDLE
RESET
CLK
8
8
3
5
8
EEPROM
3
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