73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 22
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73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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It can be loaded as a 2-byte register (MOV DPTR,#data16) or as two registers (e.g. MOV DPL,#data8). It
is generally used to access external code or data space (e.g. MOVC A,@A+DPTR or MOVX A,@DPTR
respectively).
Program Counter: The program counter (PC) is 2 bytes wide initialized to 0x0000 after reset. This
Program Status Word (PSW):
Stack Pointer (SP): The stack pointer is a 1-byte register initialized to 0x07 after reset. This register is
incremented before PUSH and CALL instructions, causing the stack to begin at location 0x08.
Data Pointer: The data pointer (DPTR) is 2 bytes wide. The lower part is DPL, and the highest is DPH.
register is incremented during the fetching operation code or when operating on data from program
memory. Note: The program counter is not mapped to the SFR area.
Port Registers: The I/O ports are controlled by Special Function Register USR70. The contents of the
SFR can be observed on corresponding pins on the chip. Writing a 1 to any of the ports (see
causes the corresponding pin to be at high level (3.3V), and writing a 0 causes the corresponding pin to
be held at low level (GND). The data direction register
pins (see the
All ports on the chip are bi-directional. Each consists of a Latch (SFR USR70), an output driver, and an
input buffer, therefore the MPU can output or read data through any of these ports if they are not used for
alternate purposes.
22
Register
USR70
UDIR70
PSW.7
PSW.6
PSW.5
PSW.4
PSW.3
PSW.2
PSW.1
PSW.0
Bit
MSB
Address
User (USR) Ports
0x90
0x91
SFR
CV
Symbol
RS1
RS0
OV
CV
AC
F0
F1
P
R/W
R/W
R/W
AC
Carry flag.
Auxiliary Carry flag for BCD operations.
General purpose Flag 0 available for user.
Register bank select control bits. The contents of RS1 and RS0 select
the working register bank:
Overflow flag.
General purpose Flag 1 available for user.
Parity flag, affected by hardware to indicate odd / even number of “one”
bits in the Accumulator, i.e. even parity.
section for details).
Register for User port bits 7:0 read and write operations (pins USR0…
USR7).
Data direction register for User port bits 0:7. Setting a bit to 0 means that
the corresponding pin is an output.
RS1/RS0
F0
Table 9: PSW Register Flags
00
01
10
11
Table 10: Port Registers
RS1
Bank Selected
RS
Bank 0
Bank 1
Bank 2
Bank 3
UDIR70
Function
Description
define individual pins as input or output
OV
–
(0x00 – 0x07)
(0x08 – 0x0F)
(0x10 – 0x17)
(0x18 – 0x1F)
Location
P
LSB
Table
Rev. 1.2
10)
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