UPD784938 Datasheet, PDF (483/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 20 IEBus CONTROLLER
20.4 Internal Registers of IEBus Controller
The IEBus controller consists of the following registers:
20.4.1 Internal register list
Table 20-8 lists the internal registers of the IEBus controller.
Table 20-8. Internal Registers of IEBus Controller
Address
IEBus Register Name
0FFB0H
0FFB2H
0FFB4H
0FFB6H
0FFB8H
0FFB9H
0FFBAH
0FFBBH
0FFBCH
0FFBDH
0FFBEH
0FFBFH
Bus control register
Unit address register
Slave address register
Partner address register
Control data register
Telegraph length register
Data register
Unit status register
Interrupt status register
Slave status register
Communication success counter
Transmit counter
Symbol
R/W
BCR
R/W
UAR
SAR
PAR
R
CDR
R/W
DLR
DR
USR
R
ISR
R/W
SSR
R
SCR
CCR
Bit Units for Manipulation
1 bit
8 bits 16 bits
√
√
—
—
—
√
—
—
√
—
—
√
—
√
—
—
√
—
—
√
—
√
√
—
√
√
—
√
√
—
—
√
—
—
√
—
Initial Value
00H
0000H
01H
00H
41H
01H
20H
Cautions 1. The above registers are mapped to the SFR space.
2. Registers UAR, SAR, and PAR must be manipulated in word units.
3. Instructions in Read Modify Write mode (such as XCH and ROL4) cannot be used for DR, CDR,
DLR, and ISR.
Preliminary User’s Manual U13987EJ1V0UM00
483