CD2231 Intel Corporation, CD2231 Datasheet - Page 153

• Manufacturer Part Number: CD2231
• Description: CD2231 Intelligent Two-channel Lan And Wan Communications Controller
• Manufacturer: Intel Corporation

8.7.2
8.7.2.1
8.7.2.2
Datasheet
Register Name: RTPR
Register Description: Receive Timeout Period, 16-bit
Default Value: x’0000
Access: Word Read/Write
Register Name: RTPRl
Register Description: Receive Timeout Period, Low Byte
Default Value: x’00
Access: Byte Read/Write, ASYNC Mode Only
Register Name: RTPRh
Register Description: Receive Timeout Period, High Byte
Default Value: x’00
Access: Byte Read/Write, ASYNC Mode Only
Bit 15
Bit 7
Bit 7
Bit 7
This register provides the initialization value for the timer prescaler that is itself clocked by a
prescaled clock equal to system clock
various on-chip timers (including RTPR, TTR, and the general timers available to the host in the
Synchronous modes). The minimum value loaded in this register to maintain accuracy in the timer
is 0A hex.
Receive Timeout Period Register (RTPR) — Async Mode Only
Receive Timeout Period Register low (RTPRl) — Async Mode Only
Receive Timeout Period Register high (RTPRh) — Async Mode Only
Receive Timeout Period register (16 bits)
This value sets the receive data timeout period. As each character is moved to the receive FIFO or
the last data is transferred from the FIFO to the host, the receive timer (an internal timer) is
reloaded with the Receive Timeout Period register. The receive timer is decremented on each ‘tick’
of the prescaler counter, whose period is controlled by TPR. If the receive timer reaches zero, it
causes a receive data interrupt.
Bit 14
Bit 6
Bit 6
Bit 6
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Bit 13
Bit 5
Bit 5
Bit 5
Binary value, bits 15:8
Bit 12
Binary value, bits 7:0
Bit 4
Bit 4
Bit 4
Binary value
Binary value
2048. The timer prescaler establishes the clock for the
Bit 11
Bit 3
Bit 3
Bit 3
Bit 10
Bit 2
Bit 2
Bit 2
Motorola Hex Address: x’24
Motorola Hex Address: x’25
Motorola Hex Address: x’24
Bit 9
Bit 1
Bit 1
Bit 1
Intel Hex Address: x’26
Intel Hex Address: x’26
Intel Hex Address: x’27
Bit 8
Bit 0
Bit 0
Bit 0
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