Z8E520 Datasheet, PDF (38/43 Pages) Zilog, Inc. – 1.5 MBPS USB Device Controller

Z8E520/C520
1.5 MBPS USB Device Controller
Z8PLUS SYSTEM REGISTERS (Continued)
Zilog
0C0
TCTLLO
D7
D6 D5 D4
D3 D2
D1 D0
D2 D1 D0
TIMER STATUS
T0
T1
0 0 0 DISAB. DISAB.
0 0 1 ENAB. DISAB.
0 1 0 DISAB. ENAB.
0 1 1 ENAB. ENAB.
1 0 0 T01 (PWM)
1 0 1 ENAB.(*) DISAB.
1 1 0 DISAB. ENAB.(*)
1 1 1 T32 (16 BIT)
(NOTE: (*) INDICATES AUTO-RELOAD
IS ACTIVE.)
D3 0: 6 MHz CR
D3 1: 12 MHz CR
D4 0: CORE CLK = ÷ (XTAL VALUE)
D4 1: CORE CLK = XTAL ÷ 2
1 = T32 16-BIT TIMER ENABLED WITH
AUTO-RELOAD ACTIVE
0 = T2 AND T3 TIMERS DISABLED
D6 1: PWM MODE IN T0 (PA1 IS OUTPUT)
D7 1: CAPTURE MODE IN T0 (PA0 IS INPUT)
NOTE: TIMER T01 IS A 16-BIT PWM TIMER FORMED BY CASCADING 8-BIT TIMERS
T1 (MSB) AND T0 (LSB). TIMER T32 IS A STANDARD 16-BIT TIMER FORMED
BY CASCADING 8-BIT TIMERS T3(MSB) AND T2(LSB).
NOTE: CLOCK “DIVIDE BY” MODE (÷) ALLOWS FOR LOWER POWER FOR RS232 OR FASTER
CPU EXECUTION WITH ZIE AT NORMAL 6 MHZ CLOCK RATE.
Figure 25. TCTLLO Register
38
PRELIMINARY
DS97KEY2005