EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 326

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
ZDI Status Register
The ZDI Status register provides current information on the eZ80F91 device and
the CPU. See Table 199.
Table 199. ZDI Status Register
(ZDI_STAT = 03h in the ZDI Register Read Only Address Space)
Bit
Reset
CPU Access
Note: R = Read Only.
Bit
Position
7
ZDI_ACTIVE
6
5
halt_SLP
4
ADL
3
MADL
2
IEF1
[1:0]
RESERVED
Value Description
0
1
0
0
1
0
1
0
1
0
1
00
P R E L I M I N A R Y
R
7
0
The CPU is not functioning in ZDI mode.
The CPU is currently functioning in ZDI mode.
Reserved.
The CPU is not currently in HALT or SLEEP mode.
The CPU is currently in HALT or SLEEP mode.
The CPU is operating in Z80 MEMORY mode.
(ADL bit = 0)
The CPU is operating in ADL MEMORY mode.
(ADL bit = 1)
The CPU’s Mixed-Memory mode (MADL) bit is reset to 0.
The CPU’s Mixed-Memory mode (MADL) bit is set to 1.
The CPU’s Interrupt Enable Flag 1 is reset to 0. Maskable
interrupts are disabled.
The CPU’s Interrupt Enable Flag 1 is set to 1. Maskable
interrupts are enabled.
Reserved.
R
6
0
R
5
0
R
4
0
R
3
0
Product Specification
R
ZiLOG Debug Interface
2
0
eZ80F91 MCU
R
1
0
R
0
0
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