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參數(shù)資料
| 型號： | P87C748EBPN |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 80C51 8-bit microcontroller family 2K/64 OTP/ROM, low pin count |
| 中文描述： | 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001AF, SOT222-1, DIP-24 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 131K |
| 代理商： | P87C748EBPN |
Philips Semiconductors
Preliminary specification
83C748/87C748
80C51 8-bit microcontroller family
2K/64 OTP/ROM, low pin count
1999 Apr 15
9
Table 2.
8XC748 Special Function Registers
SYMBOL
DESCRIPTION
DIRECT
ADDRESS
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB
LSB
RESET
VALUE
ACC*
B*
DPTR:
Accumulator
B register
Data pointer
(2 bytes)
High byte
Low byte
E0H
F0H
E7
F7
E6
F6
E5
F5
E4
F4
E3
F3
E2
F2
E1
F1
E0
F0
00H
00H
DPH
DPL
83H
82H
00H
00H
AF
EA
AE
–
AD
–
AC
–
AB
ETI
AA
EX1
A9
ET0
A8
EX0
IE*#
Interrupt enable
ABH
00H
82
–
81
–
80
–
P0*#
Port 0
80H
–
–
–
–
–
xxxxx111B
97
T0
B7
96
INT1
B6
95
INT0
B5
94
–
B4
93
–
B3
92
–
B2
91
–
B1
90
–
B0
P1*
P3*
Port 1
Port 3
90H
B0H
FFH
FFH
PCON#
Power control
87H
–
–
–
–
–
–
PD
IDL
xxxxxx00B
D7
CY
D6
AC
D5
F0
D4
RS1
D3
RS0
D2
OV
D1
–
D0
P
PSW*
Program status word
D0H
00H
SP
Stack pointer
81H
07H
8F
8E
C/T
8D
TF
8C
TR
8B
IE0
8A
IT0
89
IE1
88
IT1
TCON*#
Timer/counter control
88H
GATE
00H
TL#
TH#
Timer low byte
Timer high byte
8AH
8CH
00H
00H
DF
–
–
DE
–
–
DD
0
CLRTI
DC
DB
–
–
DA
–
–
D9
–
–
D8
–
–
TICON*#
Timer I control
D8H/RD
WR
8BH
8DH
TIRUN
TIRUN
0000xx00B
RTL#
RTH#
SFRs are bit addressable.
#
SFRs are modified from or added to the 80C51 SFRs.
Timer low reload
Timer high reload
00H
00H
*
I/O Port Structure
The 8XC748 has two 8-bit ports (ports 1 and 3) and one 3-bit port
(port 0). All three ports on the 8XC748 are bidirectional. Each
consists of a latch (special function register P0, P1, P3), an output
driver, and an input buffer. Three port 1 pins and two port 0 pins are
multifunctional. In addition to being port pins, these pins serve the
function of special features as follows:
Port Pin
P1.5
P1.6
P1.7
Alternate Function
INT0 (external interrupt 0 input)
INT1 (external interrupt 1 input)
T0 (timer 0 external input)
Ports 1 and 3 are identical in structure to the same ports on the
80C51. The structure of port 0 on the 8XC748 is similar to that of the
80C51 but does not include address/data input and output circuitry.
As on the 80C51, ports 1 and 3 are quasi-bidirectional while port 0 is
bidirectional with no internal pullups.
Timer/Counter
The 8XC748 has two timers: a 16-bit timer/counter and a 10-bit
fixed-rate timer. The 16-bit timer/counter’s operation is similar to
mode 2 operation on the 80C51, but is extended to 16 bits. The
timer/counter is clocked by either 1/12 the oscillator frequency or by
transitions on the T0 pin. The C/T pin in special function register
TCON selects between these two modes. When the TCON TR bit is
set, the timer/counter is enabled. Register pair TH and TL are
incremented by the clock source. When the register pair overflows,
the register pair is reloaded with the values in registers RTH and
RTL. The value in the reload registers is left unchanged. See the
83C748 counter/timer block diagram in Figure 4. The TF bit in
special function register TCON is set on counter overflow and, if the
interrupt is enabled, will generate an interrupt.
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