ZLP32300 datasheet(40/99 Pages) ZILOG

40 / 99 page

Crimzon® ZLP32300

Product Specification

PS020823-0208

Functional Description

When T8 is enabled, the output T8_OUT switches to the initial value (CTR1, D1). If the

initial value (CTR1, D1) is 0, TC8L is loaded; otherwise, TC8H is loaded into the counter.

In SINGLE-PASS mode (CTR0, D6), T8 counts down to 0 and stops, T8_OUT toggles,

the time-out status bit (CTR0, D5) is set, and a time-out interrupt can be generated if it is

enabled (CTR0, D1). In MODULO-N mode, upon reaching terminal count, T8_OUT is

toggled, but no interrupt is generated. From that point, T8 loads a new count (if the

T8_OUT level now is 0), TC8L is loaded; if it is 1, TC8H is loaded. T8 counts down to 0,

toggles T8_OUT, and sets the time-out status bit (CTR0, D5), thereby generating an inter-

rupt if enabled (CTR0, D1). One cycle is thus completed. T8 then loads from TC8H or

TC8L according to the T8_OUT level and repeats the cycle, see Figure 18.

Figure 18. 8-Bit Counter/Timer Circuits

You can modify the values in TC8H or TC8L at any time. The new values take effect

when they are loaded.

To ensure known operation do not write these registers at the time the values are to be

loaded into the counter/timer. An initial count of 1 is not allowed (a non-function oc-

curs). An initial count of 0 causes TC8 to count from 0 to FFh to FEh.

The letter h denotes hexadecimal values.

Transition from 0 to FFh is not a timeout condition.

CTR0 D1

Negative Edge

Positive Edge

Z8 Data Bus

IRQ4

CTR0 D2

SCLK

Z8 Data Bus

CTR0 D4, D3

Clock

T8_OUT

LO8

TC8H

TC8L

Clock

Select

8-Bit

Counter T8

HI8

Caution:

Note:

ZLP32300 Datasheet(PDF) 40 Page - Zilog, Inc.

ZLP32300 Datasheet(HTML) 40 Page - Zilog, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

Datasheet Download

Link URL