ST92T163E View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92T163E

8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS, 20K ROM, 2K RAM, I2C, SCI, & MFT

STMicroelectronics 

ST92163 - GENERAL DESCRIPTION

INTRODUCTION (Cont’d)

1.1.1 Core Architecture

The nucleus of the ST92163 is the enhanced ST9

Core that includes the Central Processing Unit

(CPU), the register file, the interrupt and DMA con-

troller, and the Memory Management Unit (MMU).

Three independent buses are controlled by the

Core: a 22-bit memory bus, an 8-bit register ad-

dressing bus and a 6-bit interrupt/DMA bus which

connects the interrupt and DMA controllers in the

on-chip peripherals with the core.

This multiple bus architecture makes the ST9 fam-

ily devices highly efficient for accessing on and

off-chip memory and fast exchange of data with

the on-chip peripherals.

The general-purpose registers can be used as ac-

cumulators, index registers, or address pointers.

Adjacent register pairs make up 16-bit registers for

addressing or 16-bit processing. Although the ST9

has an 8-bit ALU, the chip handles 16-bit opera-

tions, including arithmetic, loads/stores, and mem-

ory/register and memory/memory exchanges.

Many opcodes specify byte or word operations,

the hardware automatically handles 16-bit opera-

tions and accesses.

For interrupts or subroutine calls, the CPU uses a

system stack in conjunction with the stack pointer

(SP). A separate user stack has its own SP. The

separate stacks, without size limitations, can be in

on-chip RAM (or in Register File) or off-chip mem-

ory.

1.1.2 Instruction Set

The ST9 instruction set consists of 94 instruction

types, including instructions for bit handling, byte

(8-bit) and word (16-bit) data, as well as BCD and

Boolean formats. Instructions have been added to

facilitate large program and data handling through

the MMU, as well as to improve the performance

and code density of C Function calls. 14 address-

ing modes are available, including powerful indi-

rect addressing capabilities.

The bit-manipulation instructions of the ST9 are

set, clear, complement, test and set, load, and var-

ious logic instructions (AND, OR, and XOR). Math

functions include add, subtract, increment, decre-

ment, decimal adjust, multiply and divide.

1.1.3 External MEMORY INTERFACE

The ST92163 device has a 16-bit external address

bus allowing it to address up to 64K bytes of exter-

nal memory.

1.1.4 OPERATING MODES

To optimize performance versus the power con-

sumption of the device, ST9 devices now support

a range of operating modes that can be dynami-

cally selected depending on the performance and

functionality requirements of the application at a

given moment.

Run Mode. This is the full speed execution mode

with CPU and peripherals running at the maximum

clock speed delivered by the Phase Locked Loop

(PLL) of the Clock Control Unit (CCU).

Slow Mode. Power consumption can be signifi-

cantly reduced by running the CPU and the periph-

erals at reduced clock speed using the CPU Pres-

caler and CCU Clock Divider.

Wait For Interrupt Mode. The Wait For Interrupt

(WFI) instruction suspends program execution un-

til an interrupt request is acknowledged. During

WFI, the CPU clock is halted while the peripheral

and interrupt controller keep running at a frequen-

cy programmable via the CCU. In this mode, the

power consumption of the device can be reduced

by more than 95% (LP WFI).

Halt Mode. When executing the HALT instruction,

and if the Watchdog is not enabled, the CPU and

its peripherals stop operating and the status of the

machine remains frozen (the clock is also

stopped). A reset is necessary to exit from Halt

mode.

Stop Mode. Under user program control, (see

Wake-up and Interrupt Management Unit), the

CPU and its peripherals stop operating and the

status of the machine remains frozen (the clock is

also stopped) until program execution is woken up

by an event on an external Wake-up pin.

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