at75c220 ATMEL Corporation, at75c220 Datasheet - Page 82

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

USART User Interface
Base Address USART A: 0xFF018000
Base Address USART B: 0xFF01C000
Notes:
82
Offset
0x0C
0x1C
0x2C
0x3C
0x00
0x04
0x08
0x10
0x14
0x18
0x20
0x24
0x28
0x30
0x34
0x38
0x40
0x44
1. This is either 0x18 or 0x418 depending on the value of bootn and modem control inputs.
2. This depends on the value of modem control input signals, as these are reflected in this register.
Register Name
US_BRGR
US_RTOR
US_TTGR
US_CSR
US_RHR
US_THR
US_RPR
US_RCR
US_TCR
US_TPR
US_IMR
AT75C220
US_IER
US_IDR
US_MR
US_MC
US_MS
US_CR
–
Description
Control Register
Mode Register
Interrupt Enable Register
Interrupt Disable Register
Interrupt Mask Register
Channel Status Register
Receiver Holding Register
Transmitter Holding Register
Baud Rate Generator Register
Receiver Time-out Register
Transmitter Time-guard Register
Reserved
Receive Pointer Register
Receive Counter Register
Transmit Pointer Register
Transmit Counter Register
Modem Control Register
Modem Status Register
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read-only
Read-only
Read-only
Read-only
Write-only
Write-only
Write-only
Write-only
Write-only
Access
–
Reset Value
(See Note 2)
0x18
–
0
–
–
0
0
–
0
0
0
–
0
0
0
0
–
(1)