Maxim-integrated High-Speed Microcontroller Users Guide: Network Mi Uživatelský manuál stáhnout pdf (Strana 118)

High-Speed Microcontroller User’s

Guide: Network Microcontroller

Supplement

118

ADDENDUM TO SECTION 11: PROGRAMMABLE TIMERS

The timers of the DS80C400 are very similar to those described in the High-Speed Microcontroller User’s Guide. The primary changes

concern the removal of the PMM2 option, the inclusion of the clock multiplier settings (CD1:0, 4X/), and the addition of a fourth timer,

timer 3. Timer 3 supports three modes of operation: 13-bit timer/counter, 16-bit timer/counter, and 8-bit timer/counter with autoreload.

Timer 3 is accessible to serial port 2 for baud-rate generation in serial modes 1 and 3. The SFR bits controlling the function of timer 3

are summarized in Table 11-1 and Figures 11-1 through 11-8.

Table 11-1. Timer 3 SFR Bit Summary

Figure 11-1. Timers/Counters 0, 1, and 3, Modes 0 and 1

BIT NAMES DESCRIPTION REGISTER LOCATION BIT POSITIONS

GATE

Gate control enable for INT3 pin

T3CM–FDh T3CM.3

C/T Counter/timer select T3CM–FDh T3CM.2

M1, M0 Timer mode select bits T3CM–FDh T3CM.1

TF3 Timer overflow flag T3CM–FDh T3CM.7

TR3 Timer run control T3CM–FDh T3CM.6

T3M Input clock select (/ 4) T3CM–FDh T3CM.5

Timer LSB TL0–FBh

Timer MSB TH0–FCh

MODE 0

M1, M0=TMOD.1:0

(M1, M0=TMOD.5:4)

(M1, M0 = T3CM.1:0)

MODE 1

T0 = P3.4

(T1 = P3.5)

(T3

= P5.2)

TR0 = TCON.4

(TR1 = TCON.6)

(TR3 = T3CM.6)

GATE = TMOD.3

(GATE = TMOD.7)

(GATE = T3CM.3)

INT0 = P3.2

(

INT1 = P3.3)

( INT3= P1.5)

TF0 = TCON.5

(TF1 = TCON.7)

(TF3 = T3CM.7)

TIMER 1 and TIMER 3 FUN

CTIONS

SHOWN IN PARENTHESES ()

INTERRUPT

TL0

(TL1)

(TL3)

TH0

(TH1)

(TH3)

CLK

T0M = CKCON.3

(T1M = CKCON.4

(T3M = T3CM.5)

T = TMOD.2

(C/

T = TMOD.6

(C/

= T3CM.2)

CD1:0

CLK OUT

11 /3,072

other /12

4X/ X2 CD1:0 CLK OUT

1 00 /1

0 00 /2

x 10 /4

x 11

/1,024

OSC

Maxim Integrated

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 220 221

NETWORKED MICROCONTROLLER 1
Supplement 10

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