z86e72 ZiLOG Semiconductor, z86e72 Datasheet - Page 64

• Manufacturer Part Number: z86e72
• Description: Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

Z86E72/73
OTP Microcontroller
60
TC16H*256+TC16L Counts
“Counter Enable” Command,
T16_OUT Toggles,
T16_OUT Switches To Its
Time-Out Interrupt
Initial Value (CTR1 D0)
Figure 33. T16_OUT in Single-Pass Mode
TC16H*256+TC16L
TC16H*256+TC16L
T16_OUT
TC16H*256+TC16L
“Counter Enable” Command,
T16_OUT Toggles,
T16_OUT Toggles,
T16_OUT Switches To Its
Time-Out Interrupt
Time-Out Interrupt
Initial Value (CTR1 D0)
Figure 34. T16_OUT in Modulo-N Mode
You can modify the values in TC16H and TC16L at any time. The new values take
effect when they are loaded. To ensure known operation, do not load these regis-
ters at the time the values are to be loaded into the counter/timer. An initial count
of 1 is not allowed. An initial count of 0 causes T16 to count from 0 to FFFFh to
FFFEh. Transition from 0 to FFFFh is not a time-out condition.
T16 Demodulation Mode
You need to program TC16L and TC16H to FFh. After T16 is enabled, when the
first edge (rising, falling or both depending on CTR1, D5, D4) is detected, T16
captures HI16 and LO16, reloads, and begins counting.
If D6 of CTR2 Is 0
When a subsequent edge (rising, falling, or both depending on CTR1 D5, D4) is
detected during counting, the current count in T16 is one's complemented and put
into HI16 and LO16. When data is captured, one of the edge-detect status bits
(CTR1 D1, D0) is set, and an interrupt is generated if enabled (CTR2 D2). T16 is
loaded with FFFFh and starts again.
PS008704-0507