DS_1217F_002
73S1217F Data Sheet
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 Oscillator and Clock Generation
The 73S1217F 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 crystal or external clock frequencies. An
internal divider working in conjunction with a PLL and VCO provides a 96MHz internal clock within the
73S1217F. 96 MHz is the required frequency for proper operation of specific peripheral blocks such as
the USB, specific timers, ISO 7816 UART and interfaces, Step-up converter, and keypad. The clock
generation and control circuits are shown in Figure 3.
MCount(2:0)
X12IN
HOSCen
USBCKenb
HIGH
XTAL
OSC
HCLK
12.00MHz
M DIVIDER
/(2*N + 4)
12.00MHz
USBCLK
div 2
48MHz
X12OUT
X32IN
DIVIDER
/2930
LOW
XTAL
OSC
Phase
Freq
DET
32768Hz
MCLK
96MHz
VCO
LMCLK=32765Hz
X32OUT
RTCCLK
Mux
LCLK=32768Hz
KEYCLK
1kHz
DIV
32
32KOSCenb
CPU CLOCK
DIVIDER
6 bits
1.5-48MHz
7.386MHz
ICLK
7.386MHz
CPUCKDiv
MPU CLOCK - CPCLK
3.6923MHz
I2CCLK
DIVIDE
by 120
400kHz
I2C_2x
800kHz
CLK1M
DIVIDE
by 96
1MHz
SMART CARD LOGIC
BLOCK CLOCK
SCCLK
SC/SCE
CLOCK
Prescaler 6bits
SEL
ETU CLOCK
ETUCLK
SCECLK
SCLK
CLOCK
Prescaler 6bits
DIVIDER
12 bits
SELSC
See SC Clock descriptions for more accurate diagram
SCCKenb
Figure 3: Clock Generation and Control Circuits
Rev. 1.2
23
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
