UT80C196 datasheet(19/42 Pages) AEROFLEX

19 / 42 page

TDO

HSO.2

---

High Speed Output Module, output pin 2. The HSO.2 pin is a

dedicated output for the HSO module.

TDO

HSO.3

---

High Speed Output Module, output pin 3. The HSO.3 pin is a

dedicated output for the HSO module.

GND

VSS

---

Digital circuit ground (0V). There are 4 VSS pins, all of which

must be connected and one additional recommeded V

SS connec-

tion.

EDACEN

Low

EDAC Enable. Asserting the EDACEN signal activates the

error detection and correction engine. This causes the

UT80C196KD to include ECB(5:0) as the EDAC check bit pins

in all external memory cycles.

TUQ

P2.7

---

Port 2 Pin 7. A quasi-bidirectional port pin that is read and writ-

ten at location 10h of HWindow 0.

TUQ

T2CAPTURE

High

Timer 2 Capture. A rising edge on this pin loads the value of

Timer 2 into the T2CAPTURE register, and generates a Timer 2

Capture interrupt (INT11, 2036h). Assert the T2CAPTURE sig-

nal for at least 2 state times to guarantee acknowledgment by the

interrupt controller. Using INT_Mask1.3 controls whether or not

a rising edge causes an interrupt.

TDO

P2.5

---

Port 2 Pin 5. An output only port pin that is written at location

10h of HWindow 0.

Setting IOC1.0 = 0 enables the P2.5 function of pin 39.

TDO

PWM0

---

Pulse Width Modulator (PWM) Output 0. The output signal

will be a waveform whose duty cycle is programmed by the

PWM0_CONTROL register, and the frequency is selected by

IOC2.2.

Setting IOC1.0 = 1 enables the PWM0 function of pin 39.

TUO

Low

Write. The WR signal indicates that an external write is occur-

ring. Activation of this signal only occurs during external mem-

ory writes.

Setting CCR.2 = 1 enables the WR function of pin 40.

TUO

WRL

Low

Write Low. The WRL signal is activated when writing the low

byte of a 16-bit wide word, and is always asserted for 8-bit wide

memory writes.

Setting CCR.2 = 0 enables the WRL function of pin 40.

Table 10: 68-lead Flat Pack Pin Descriptions

QFP Pin#

I/O

Name

Active

Description

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