Rainbow-electronics AT89LP216 Bedienungsanleitung PDF herunterladen (Seite 31)

3621A–MICRO–6/06

AT89LP216 [Preliminary]

Table 14-2. TMOD: Timer/Counter Mode Control Register

TMOD = 88H Reset Value = 0000 0000B

Not Bit Addressable

GATE C/T M1 M0 GATE C/T M1 M0

543210

Timer1 Timer0

Gate Gating control when set. Timer/Counter x is enabled only

while INTx

pin is high and TRx control pin is set. When

cleared, Timer x is enabled whenever TRx control bit

is set.

Timer 0 gate bit

C/T

Timer or Counter Selector cleared for Timer operation

(input from internal system clock). Set for Counter

operation (input from Tx input pin).

Timer 0 counter/timer select bit

M1 Timer 1 Mode bit 1 Timer 0 M1 bit

M0 Timer 1 Mode bit 0 Timer 0 M0 bit

M1 M0 Mode Operating Mode

000Variable 9 - 16-bit Timer Mode.

8-bit Timer/Counter THx with TLx as 1 - 8-bit prescaler.

0 1 1 16-bit Auto-Reload Mode.

16-bit Timer/Counters THx and TLx are cascaded; there is no prescaler.

1028-bit Auto Reload.

8-bit auto-reload Timer/Counter THx holds a value which is to be

reloaded into TLx each time it overflows.

113Split Timer Mode.

(Timer 0) TL0 is an 8-bit Timer/Counter controlled by the standard

Timer 0 control bits. TH0 is an 8-bit timer only controlled by Timer 1

control bits.

113(Timer 1) Timer/Counter 1 stopped.

Timer SFR Purpose Address Bit-Addressable

TCON Control 88H Yes

TMOD Mode 89H No

TL0 Timer 0 low-byte 8AH No

TL1 Timer 1 low-byte 8BH No

TH0 Timer 0 high-byte 8CH No

TH1 Timer 1 high-byte 8DH No

TCONB Mode 91H No

RL0 Timer 0 reload low-byte 92H No

RL1 Timer 1 reload low-byte 93H No

RH0 Timer 0 reload high-byte 94H No

RH1 Timer 1 reload high-byte 95H No

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 89 90

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