24 .+/+0 4 241&7%6 52 %+(+% 6+10 < 5 < . 0* 0% & < /+%41241% 5514 1(( 45 ( 56 4 : %76+10 219 4 5 8 4 /1& .19 /+ ( 674 5 Code Compatible with ZiLOG Z80 CPU Two 16-Bit Counter/Timers Extended Instructions Two Enhanced UARTs (up to 512 Kbps) Two Chain-Linked DMA Channels Clock Speeds: 10, 20, 33 MHz Low Power-Down Modes Operating Range: 5V (3.3V 20 MHz) On-Chip Interrupt Controllers Operating Temperature Range: 0C to +70C Three On-Chip Wait-State Generators 40C to +85C Extended Temperature Range On-Chip Oscillator/Generator Three Packaging Styles 68-Pin PLCC Expanded MMU Addressing (Up to 1 MB) 64-Pin DIP Clocked Serial I/O Port 80-Pin QFP ) 0 4 . & 5%4+26+10 three modes intended to further reduce power consumption. The enhanced Z8S180/Z8L180 significantly improves on Power consumption during 56 0& Mode is reduced to previous Z80180 models, while still providing full back- 10 A by stopping the external oscillators and internal ward compatibility with existing ZiLOG Z80 devices. The clock. The 5. 2 mode reduces power by placing the CPU Z8S180/Z8L180 now offers faster execution speeds, pow- into a stopped state, consuming less current while the on- er-saving modes, and EMI noise reduction. chip I/O devices still operate. The 5 56 / 5612 mode This enhanced Z180 design also incorporates additional places both the CPU and the on-chip peripherals into a feature enhancements to the ASCIs, DMAs, and 56 0& stopped mode, reducing power consumption even further. mode power consumption. With the addition of ESCC-like A new clock-doubler feature in the Z8S180/Z8L180 allows Baud Rate Generators (BRGs), the two ASCIs offer the flex- the internal clock speed to be twice the external clock speed. ibility and capability to transfer data asynchronously at rates As a result, system cost is reduced by allowing the use of of up to 512 Kbps. In addition, the ASCI receiver features lower-cost, lower-frequency crystals. a 4-byte first in/first out (FIFO) buffer which reduces the likelihood of overrun errors. The DMAs have been modified The Enhanced Z180 is housed in 80-pin QFP, 68-pin PLCC, to allow for chain-linking of the two DMA channels when and 64-pin DIP packages. set to take their DMA requests from the same peripherals device. This feature allows for nonstop DMA operation be- 0QVG All Signals with an overline are active Low. For exam- tween the two DMA channels. ple: B/W, in which WORD is active Low or B/W, in which BYTE is active Low. Not only does the Z8S180/Z8L180 consume less power dur- ing normal operations than the previous model, it offers &5 </2 < 5 < . PJCPEGF < /KETQRTQEGUUQT ZiLOG ) 0 4 . & 5%4+26+10 %QPVKPWGF Power connections follow the conventional descriptions be- low: %QPPGEVKQP %KTEWKV &GXKEG 2QYGT 8 8 %% && )TQWPF )0& 8 55 WU 5VCVG %QPVTQN +PVGTTWRV 6KOKPI 2*+ )GPGTCVQT %27 &4 3 KV &/ %U 2TQITCOOCDNG 6 6 0& 176 4GNQCF 6KOGTU 6:5 6: %NQEMGF 5GTKCN + 1 4:5 %65 %- &4 3 2QTV U PEJTQPQWU 5%+ %-5 4: %JCPPGN 465 %65 &%& 6: //7 U PEJTQPQWU %- 6 0& 5%+ 4: %JCPPGN 8 && FFTGUU &CVC WHHGT WHHGT 8 55 & & (KIWTG < 5 < . (WPEVKQPCN NQEM &KCITCO 2 4 . + / + 0 4 &5 </2 :6 . :6 . FFTGUU WU KV 4 5 6 4& 94 &CVC WU KV / /4 3 +143 * .6 9 +6 754 3 75 %- 4(5* 56 0/+ +06 +06 +06