Zilog Z16C30 - Manual (Page 167)

8-12
Z16C30 USC ®
U SER ' S M ANUAL Z ILOG
UM97USC0100
14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15
RTCmd
Channel Command/Address Register (CCAR) Register Address 0 b 00000
Bit(s)
Field/Bit
Name
Conditions
/Context
Description
RW
Status
Ref Chapter: Section
RegAddr
CCAR15-12
RT
Reset
RTMode
Chan
Load
B//W U//L
RTCmd 00000=no operation
00001=Reserved
00010=Reset Highest Serial IUS
00100=Trigger Channel Load DMA
00101=Trigger Rx DMA
00110=Trigger Tx DMA
00111=Trigger Rx and Tx DMA
01001=Purge Rx FIFO
01010=Purge Tx FIFO
01011=Purge Rx and Tx FIFO
01101=Load RCC
01110=Load TCC
01111=Load RCC and TCC
10001=Load TC0
10010=Load TC1
10011=Load TC0 and TC1
10100=Select Serial Data LSBit First
10101=Select Serial Data MSBit FIrst
10110=Select D15-8 First
10111=Select D7-0 First
11001=Purge Rx
all other values are Reserved
and should not be programmed WO 5: Commands
CCAR10 RTReset 1=put channel in software Reset state
0=release it from Reset state RW 5: Resetting a USC
Channel
CCAR9-8 RTMode 00=normal mode: Tx and Rx are independent
01=echo RxD to TxD
10=Local Loop TxD to RxD
11=internal Local Loop RW 4: The RxD and TxD Pins
CCAR7 ChanLoad 1=continue Channel Load operation;
0=terminate it RW 8: Using DMA to Initialize
a Channel Channel
Load DMA
CCAR6 B//W 0=16-bit access to register selected by RegAddr
1=access MS or LS byte of register WOC 2: Register Addressing 16-bit bus
CCAR5-1 RegAddr
register address for next access to CCAR
(see Table 1)
WOC
CCAR0 U//L 1=access MSByte of reg selected by RegAddr
0=access LSByte or whole 16-bit register WOC
RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.
UM009402-0201