SLRC400 Datasheet, PDF (49/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
5.2.6.3 TimerClock Register
Selects the devider for the timer clock.
Name: TimerClock
Address: 0x2A
Reset value: 00001011, 0x0B
7
6
5
4
3
2
1
0
0
0
TAutoRestart
TPreScaler
Access
r/w
r/w
r/w
Rights
r/w
r/w
r/w
r/w
r/w
Description of the bits
Bit
Symbol
7-6
00
5
TAutoRestart
4-0
TPreScaler
Function
These values shall not be changed
If set to 1, the timer automatically restart its count-down from TReloadValue,
instead of counting down to zero.
If set to 0 the timer decrements to zero and the bit TimerIRq is set to 1.
Defines the timer clock f_Timer. TPreScaler can be adjusted from 0x00 up to 0x15.
The following formula is used to calculate f_Timer :
f_Timer = 13.56 MHz / 2^TPreScaler.
49
Preliminary