参数资料
型号: ST78C36ACJ44-F
厂商: Exar Corporation
文件页数: 26/27页
文件大小: 0K
描述: IC UART FIFO 16B 44PLCC
标准包装: 27
特点: *
FIFO's: 16 字节
规程: 打印机
电源电压: 5V
带并行端口:
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 管件
ST78C36/36A
8
ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO
REV. 5.1.0
3.9
TEST FIFO ( T-FIFO )
This port is available for programmed I/O and DMA access. Data written to this port is stored in the FIFO if
FIFO-F = 0 and will be lost if FIFO-F = 1. During a read cycle from this port a FIFO under-run will return last
data read and FIFO-E remains coherent.
3.10
CONFIGURATION REGISTER A ( Cnfg-A )
This read-only register is available in ECR mode 111 only.
Cnfg-A Bits 1-0:
Forced to logic zero, this field is don’t care for PWord = 1 byte.
Cnfg-A Bit-2:
When transmitting, there is 1 byte waiting to be transmitted that does not affect FIFO-F.
Cnfg-A Bit-3:
Reserved, logic zero.
Cnfg-A Bits 6-4:
Indicates PWord = 1 byte (8-bit implementation).
Cnfg-A Bit-7:
Indicates ECP interrupts are pulsed.
3.11
CONFIGURATION REGISTER B ( Cnfg-B )
This register is available in ECR mode 111 only, and returns bits 0-5 as logic zero for the ST78C36CJ44. The
ST78C36CQ64 will allow programmed selection of the Interrupt and DMA channels after a system RESET
state of 001011 (bits 0-5).
Cnfg-B Bits 2-0:
With bit 2 forced low, select an 8-bit DMA channel per the following table:
TABLE 1: DMA CHANNEL SELECTION: CNFG-B BITS[2:0]
WRITE TO FIFO
READ FROM FIFO
DMA CHANNEL
X00
000
3
X01
001
1
X10
010
2
X11
011
3 (Default)
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