参数资料
型号: SCD223110QCD
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 256K bps, SERIAL COMM CONTROLLER, PQFP100
封装: METRIC, QFP-100
文件页数: 166/178页
文件大小: 2247K
代理商: SCD223110QCD
CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
88
Datasheet
8.0
Detailed Register Descriptions
8.1
Global Registers
8.1.1
Global Firmware Revision Code Register (GFRCR)
This register serves two functions in providing the host with information about the CD2231. When
a hardware RESET* signal, or a software RESET ALL command is issued through either of the
two Channel Command registers, it initializes the CD2231 and zeroes this register at the start of the
initialization. At the end of the initialization, the CD2231 writes its firmware revision code to the
GFRCR. All valid CD2231 revision codes are non-zero and the revision code is incremented by
one with each new release (for example, GFRCR for Revision D = 34 hex).
Host software must confirm that the GFRCR contents are non-zero before proceeding to configure
the CD2231 for normal operation.
8.1.2
Channel Access Register (CAR)
This register contains the channel number for the channel-oriented host read or write operations
when the host is not in an interrupt service routine. The CD2231 supplies the interrupting channel
number during all interrupt service operations. The Channel Access register contents are not used
during an interrupt service. Note that this means that an interrupt service routine is restricted to
accessing only the register set of the Interrupting Channel and Global registers.
Bits 7:1
Reserved – must be ‘0’.
Bit 0
Channel number
Register Name: GFRCR
Register Description: Global Firmware Revision Code
Default Value: x’0D
Access: Byte Read/Write
Intel Hex Address: x’82
Motorola Hex Address: x’81
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Firmware revision code
Register Name: CAR
Register Description: Channel Access
Default Value: x’03
Access: Byte Read/Write
Intel Hex Address: x’EC
Motorola Hex Address: x’EE
Bit 7Bit 6Bit 5Bit 4Bit 3
Bit 2Bit 1
Bit 0
00
000
00
C0
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