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TMP88CS38 Datasheet(PDF) 15 Page - Toshiba Semiconductor |
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TMP88CS38 Datasheet(HTML) 15 Page - Toshiba Semiconductor |
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15 / 226 page  TMP88CS38/CM38A/CP38A 2007-09-12 88CS38-15 b. Edge-sensitive release mode (RELM = 0) In this mode, STOP mode is released by a rising edge of the STOP pin input. This is used in applications where a relatively short program is executed repeatedly at periodic intervals. This periodic signal (for example, a clock from a low-power consumption oscillator) is input to the STOP pin. In the edge-sensitive release mode, STOP mode is started even when the STOP pin input is high. Example: Starting STOP mode from NORMAL mode LD (SYSCR1), 10010000B ; Starts after specified to the edge-sensitive mode Figure 1.4.10 Edge-sensitive Release Mode STOP mode is released by the following sequence: 1. When returning to NORMAL, clock oscillator is turned on. 2. A warm-up period is inserted to allow oscillation time to stabilize. During warm-up, all internal operations remain halted. Two different warm-up times can be selected with WUT (Bits2 and 3 in SYSCR1) as determined by the resonator characteristics. 3. When the warm-up time has elapsed, normal operation resumes with the instruction following the STOP mode start instruction (e.g., [SET (SYSCR1). 7]). The start is made after the divider of the timing generator is cleared to “0”. Table 1.4.1 Warm-up Time Example Warm-up Time [s] Return to NORMAL mode WUT DV1CK = 0 DV1CK = 1 00 3 × 216/fc (12.29 m) 3 × 217/fc (24.58 m) 01 2 16/fc (4.10 m) 2 17/fc (8.20 m) 10 2 14/fc (1.02 m) 2 15/fc (2.05 m) 11 Reserved ( - ) Reserved ( - ) Note: The warm-up time is obtained by dividing the basic clock by the divider: therefore, the warm-up time may include a certain amount of error if there is any fluctuation of the oscillation frequency when STOP mode is released. Thus, the warm-up time must be considered an approximate value. STOP pin NORMAL operation STOP mode started by the program. XOUT pin STOP mode is released by the hardware at the rising edge of STOP pin input. VIH Warm up NORMAL operation STOP operation STOP operation |
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