ZLP128ICE01ZEM Zilog, ZLP128ICE01ZEM Datasheet - Page 76

• Manufacturer Part Number: ZLP128ICE01ZEM
• Description: EMULATOR CRIMZON Z8 ZLP12840
• Manufacturer: Zilog

Specifications of ZLP128ICE01ZEM

• Interface Type: RS-232, Ethernet, USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3829

ZLP12840 OTP MCU
Product Specification
70
(CTR1, bit 1; bit 0) is set, and an interrupt is generated if enabled (CTR2, Bit 2). T16 is
loaded with
and starts again.
FFFFh
This T16 mode is generally used to measure space time, the length of time between bursts
of carrier signal (marks).
T16 ignores the subsequent edges in the input signal and continues
If Bit 6 of CTR2 Is 1—
counting down. A time-out of T8 causes T16 to capture its current value and generate an
interrupt if enabled (CTR2, Bit 2). In this case, T16 does not reload and continues
counting. If CTR2 bit 6 is toggled (by writing a 0 then a 1 to it), T16 captures and reloads
on the next edge (rising, falling, or both depending on CTR1 bits [5:4]), continuing to
ignore subsequent edges.
This T16 mode generally measures mark time, the length of an active carrier signal burst.
If T16 reaches 0, T16 continues counting from
. Meanwhile, a status bit (CTR2 bit
FFFFh
5) is set, and an interrupt time-out can be generated if enabled (CTR2 bit 1).
PING-PONG Mode
This operation mode is only valid in TRANSMIT mode. T8 and T16 must be programmed
in SINGLE-PASS mode (CTR0, bit 6; CTR2, bit 6), and PING-PONG mode must be
programmed in CTR1 bits [3:2]. You can begin the operation by enabling either T8 or T16
(CTR0, D7 or CTR2, D7). For example, if T8 is enabled, T8_OUT is set to this initial
value (CTR1, bit 1). According to T8_OUT's level, TC8H or TC8L is loaded into T8.
After the terminal count is reached, T8 is disabled, and T16 is enabled. T16_OUT then
switches to its initial value (CTR1, bit 0), data from TC16H and TC16L is loaded, and T16
starts to count. After T16 reaches the terminal count, it stops, T8 is enabled again,
repeating the entire cycle. Interrupts can be allowed when T8 or T16 reaches terminal
control (CTR0, bit 1; CTR2, bit 1). To stop the Ping-Pong operation, write 00 to bits CTR1
bits [3:2]. See
Figure 29
on page 71.
Enabling Ping-Pong operation while the counter/timers are running might cause intermit-
Note:
tent counter/timer function. Disable the counter/timers and reset the status Flags before
instituting this operation.
PS024410-0108
P R E L I M I N A R Y
Timers