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Z86L99 Datasheet(PDF) 8 Page - Zilog, Inc. |
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Z86L99 Datasheet(HTML) 8 Page - Zilog, Inc. |
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8 / 102 page  Z86D990/Z86D991 OTP and Z86L99X ROM Low-Voltage Microcontrollers with ADC PS003807-1002 P R E L I M I N A R Y 1 Architectural Overview The Z86D99 is a low-voltage general-purpose one-time programmable (OTP) Z8® microcontroller with an integrated four-channel 8-bit sigma delta analog-to-digital converter. The Z86L99 is the read-only memory (ROM) version of this controller. The Z86D99/Z86L99 family is designed to be used in a wide variety of embedded control applications including battery chargers, home appliances, infrared (IR) remote controls, security systems, and wireless keyboards. It has three counter/timers, a general-purpose 8-bit counter/timer with a 6-bit pres- caler and an 8-bit/16-bit counter/timer pair that can be used individually for gen- eral-purpose timing or as a pair to automate the generation and reception of complex pulses or signals. Unique features of the Z86D99/Z86L99 family of prod- ucts include 489 bytes of general-purpose random-access memory (RAM), 256 bytes of which are mapped into the program memory space and can be used to store data variables or as executable RAM, a low-battery detection flag, and a controlled current output pin, which is a regulated current source that sinks a pre- defined current (ICCO). Table 1 highlights the basic product features of these microcontrollers. The Z8 microcontroller core offers more flexibility and performance than accumu- lator-based microcontrollers. All 256 general-purpose registers, including dedi- cated input/output (I/O) port registers, can be used as accumulators. This unique register-to-register architecture avoids accumulator bottlenecks for high code effi- ciency. The registers can be used as address pointers for indirect addressing, as index registers, or for implementing an on-chip stack. The Z8 has a sophisticated interrupt structure and automatically saves the pro- gram counter and status flags on the stack for fast context-switching. Speed of execution and smooth programming are also supported by a “working register area” with short 4-bit register addresses. Table 1. Z86L99/Z86D99 Feature Comparison Pins I/O Memory (Bytes) Operating Voltage (V) ADC Timers Watch-Dog Timer Z86D990 40/48 32 32K OTP 3.0–5.5 4 channel 3 Yes Z86D991 28 24 32K OTP 3.0–5.5 — 3 Yes Z86L990 40/48 32 16K ROM 2.3–5.5 4 channel 3 Yes Z86L991 28 24 16K ROM 2.3–5.5 — 3 Yes Z86L996 28 24 4K ROM 2.3–5.5 — 3 Yes Z86L997 28 24 8K ROM 2.3–5.5 — 3 Yes |
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