C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 48
C501G-1E
Manufacturer Part Number
C501G-1E
Description
8-Bit Single-Chip Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C501G-1E.pdf
(121 pages)
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On-Chip Peripheral Components
C501
6.2.1
Timer/Counter 0 and 1
Timer / counter 0 and 1 of the C501 are fully compatible with timer / counter 0 and 1 of the 80C51
and can be used in the same four operating modes:
Mode 0: 8-bit timer/counter with a divide-by-32 prescaler
Mode 1: 16-bit timer/counter
Mode 2: 8-bit timer/counter with 8-bit auto-reload
Mode 3: Timer/counter 0 is configured as one 8-bit timer/counter and one 8-bit timer; Timer/
counter 1 in this mode holds its count. The effect is the same as setting TR1 = 0.
External inputs INT0 and INT1 can be programmed to function as a gate for timer/counters 0 and 1
to facilitate pulse width measurements.
Each timer consists of two 8-bit registers (TH0 and TL0 for timer/counter 0, TH1 and TL1 for timer/
counter 1) which may be combined to one timer configuration depending on the mode that is
established. The functions of the timers are controlled by two special function registers TCON and
TMOD.
In the following descriptions the symbols TH0 and TL0 are used to specify the high-byte and the
low-byte of timer 0 (TH1 and TL1 for timer 1, respectively). The operating modes are described and
shown for timer 0. If not explicity noted, this applies also to timer 1.
Semiconductor Group
6-14
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