Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 51)

Semiconductor Group 6-17

On-Chip Peripheral Components

C501

Special Function Register TMOD (Address 89

) Reset Value : 00

Bit Function

GATE Gating control

When set, timer/counter “x” is enabled only while “INT x” pin is high and “TRx”

control bit is set.

When cleared timer “x” is enabled whenever “TRx” control bit is set.

C/T

Counter or timer select bit

Set for counter operation (input from “Tx” input pin).

Cleared for timer operation (input from internal system clock).

Mode select bits

Gate C/T M1 M089

TMOD

Bit No.

76543210

MSB LSB

Gate C/T M1 M0

Timer 1 Control Timer 0 Control

M1 M0 Function

0 0 8-bit timer/counter:

“THx” operates as 8-bit timer/counter

“TLx” serves as 5-bit prescaler

0 1 16-bit timer/counter.

“THx” and “TLx” are cascaded; there is no prescaler

1 0 8-bit auto-reload timer/counter.

“THx” holds a value which is to be reloaded into “TLx” each

time it overflows

1 1 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.

Timer 1 :

Timer/counter 1 stops

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 120 121

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Siemens EF 88H Series Manual de usuario Pagina 51