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Zilog Z16C30 User Manual

Page 182

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8-27

Z16C30 USC

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U

SER

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S

M

ANUAL

Z

ILOG

UM97USC0100

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

15

Starting value for Receive Character Counter

Receive Count Limit Register (RCLR)

Register Address 0 b 10101

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

RW

Status

Ref Chapter: Section

RCLR15-0

Starting value for RCC: 0=disable RCC;
FFFF=enable RCC, no set max frame/message
length; else maximum allowed length

RW

5: DMA Support Features:
The Character Counters

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

RW

Status

Ref Chapter: Section

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

15

Received character: read only using 16-bit operation

Receive Data Register (RDR)

Register Address 0 b 1x000 or 1 b xxxxx

The "other" received character in a 16-bit read
(may be the oldest or 2nd-oldest per "Select
D15-8 First" or "Select D7-0 First" commands in
RTCmd [CCAR15-11])

RO

5: The Data Registers and
the FIFOs

Received character: 8- or 16-bit read

RDR15-8

16-bit bus

Received character

RDR7-0

RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.

UM009402-0201