TMS320UC5402 datasheet(13/63 Pages) TI

13 / 63 page

TMS320UC5402

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS096A – APRIL 1999 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

on-chip peripherals

The ’UC5402 device has the following peripherals:

D Software-programmable wait-state generator with programmable bank-switching wait states

D An enhanced 8-bit host-port interface (HPI-8)

D Two multichannel buffered serial ports (McBSPs)

D Two hardware timers

D A clock generator with a phase-locked loop (PLL)

D A direct memory access (DMA) controller

software-programmable wait-state generator

The software wait-state generator of the ’UC5402 can extend external bus cycles by up to fourteen machine

cycles. Devices that require more than fourteen wait states can be interfaced using the hardware READY line.

When all external accesses are configured for zero wait states, the internal clocks to the wait-state generator

are automatically disabled. Disabling the wait-state generator clocks reduces the power comsumption of the

’UC5402.

The software wait-state register (SWWSR) controls the operation of the wait-state generator. The 15 LSBs of

the SWWSR specify the number of wait states (0 to 7) to be inserted for external memory accesses to five

separate address ranges. This allows a different number of wait states for each of the five address ranges.

Additionally, the software wait-state multiplier (SWSM) bit of the software wait-state control register (SWCR)

defines a multiplication factor of 1 or 2 for the number of wait states. At reset, the wait-state generator is initialized

to provide seven wait states on all external memory accesses. The SWWSR bit fields are shown in Figure 3

and described in Table 2.

XPA

I/O

Data

Program

12 11

R/W-111

R/W-0

R/W-111

LEGEND: R=Read, W=Write, 0=Value after reset

Figure 3. Software Wait-State Register (SWWSR) [Memory-Mapped Register (MMR) Address 0028h]

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