73S1215F Maxim, 73S1215F Datasheet - Page 23

• Manufacturer Part Number: 73S1215F
• Description: The Teridian 73S1215F is a self-contained SoC smart card reader IC that is an ideal solution for any USB-connected ISO 7816 design
• Manufacturer: Maxim

DS_1215F_003
All ports on the chip are bi-directional. Each consists of a Latch (SFR
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.
1.6 Instruction Set
All instructions of the generic 8051 microcontroller are supported. A complete list of the instruction set
and of the associated op-codes is contained in the 73S12xxF Software User’s Guide.
1.7 Peripheral Descriptions
1.7.1
The 73S1215F has two oscillator circuits; one for the main CPU clock and another for the RTC. The
main oscillator circuit is designed to operate with various crystals or external clock frequencies. An
internal divider working in conjunction with a PLL and VCO needs to provide a 96MHz internal clock
within the 73S1215F. 96 MHz is the required frequency for proper operation of specific peripheral blocks
such as the USB, specific timers, ISO 7816 UART and interfaces and keypad. The clock generation and
control circuits are shown in
Rev. 1.4
Register
USR70
UDIR70
USR8
UDIR8
Oscillator and Clock Generation
Address
0xA0
0xA1
0x90
0x91
SFR
R/W
R/W
R/W
R/W
R/W
Figure
Register for User port bit 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.
Register for User port bit 8 read and write operations (pin *USR8).
Data direction register for port 1.
3.
Table 11: Port Registers
Description
USR70
to USR8), an output driver,
73S1215F Data Sheet
23