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UPD17708 Folha de dados(PDF) 152 Page - Renesas Technology Corp

Nome de Peças UPD17708
Descrição Electrónicos  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Folha de dados(HTML) 152 Page - Renesas Technology Corp

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13.2 Basic Timer 0
13.2.1 Outline of basic timer 0
Figure 13-2 outlines basic timer 0.
Basic timer 0 is used as a timer by detecting in software the BTM0CY flag that is set at fixed intervals (100,
50, 20, or 10 ms).
If the BTM0CY flag is read first after power-ON reset, “0” is always read. After that, the flag is set to “1” at
fixed intervals.
If the CE pin goes high, CE reset is effected in synchronization with the timing at which the BTM0CY flag is
set next.
Therefore, a power failure can be detected by reading the content of the BTM0CY flag at system reset (power-
ON reset or CE reset).
For the details of power failure detection, refer to 21. RESET.
Figure 13-2. Outline of Basic Timer 0
Remarks 1. BTM0CK1 and BTM0CK0 (bits 1 and 0 of basic timer 0 clock selection register: refer to Figure
13-3) set the time intervals at which the BTM0CY flag is set.
2. BTM0CY (bit 0 of basic timer 0 carry register: refer to Figure 13-4) detects the status of the
flip-flop.
Divider
Clock selection block
4.5 MHz
BTM0CY flag
Selector
BTM0CK0 flag
BTM0CK1 flag
Flip-flop



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