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MC68340 Datasheet(PDF) 360 Page - Freescale Semiconductor, Inc |
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MC68340 Datasheet(HTML) 360 Page - Freescale Semiconductor, Inc |
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360 / 441 page  8- 16 MC68340 USER’S MANUAL MOTOROLA 8.3.8 Timer Bypass In this mode, the counter and prescaler cannot be enabled. However TGATE ≈ and TOUTx can be used for I/O. This mode can be selected by programming the CR MODE bits to 111. TGATE ≈ can be used as a simple input port when the CR is configured as follows: CR 15 14 13 12 11 10 9876543210 SWR IE2 IE1 IE0 TGE PCLK CPE CLK POT2 POT1 POT0 MODE2 MODE1 MODE0 OC1 OC0 TGATE ≈ AS A SIMPLE INPUT XX0 XXX1 XXXX 111X X X-Don’t care When TGATE ≈ is asserted, the SR ON bit is set. When TGATE≈ is negated, the ON bit is cleared. The value of the TGL bit in the SR reflects the level of TGATE ≈. TGATE≈ can also be used as an input port that generates interrupts on a low-to-high transition of TGATE ≈ when the CR is configured as follows: CR 15 14 13 12 11 10 9876543210 SWR IE2 IE1 IE0 TGE PCLK CPE CLK POT2 POT1 POT0 MODE2 MODE1 MODE0 OC1 OC0 TGATE ≈ AS AN INPUT/INTERRUPT XX1 X1 X1 XXXX 111X X When TGATE ≈ is negated, the SR TG bit is set, and the programmed IRQx signal is asserted to the CPU32. The TG bit can only be cleared by writing a one to this bit position. The value of the SR TGL bit reflects the level of TGATE ≈. Additionally, TOUTx can be used as a simple output port when the CR is configured as follows: CR 15 14 13 12 11 10 9876543210 SWR IE2 IE1 IE0 TGE PCLK CPE CLK POT2 POT1 POT0 MODE2 MODE1 MODE0 OC1 OC0 TGATE ≈ AS A SIMPLE OUTPUT 0 XXXXX1 XXXX1 1 1 OC1 OC0 SWR must be a zero to change the value of TOUTx. Changing the value of the CR OCx bits determines the level of TOUTx as shown in Table 8-1. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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