EZ80F91MCU Datasheet, PDF (54/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
35
Register Map
All on-chip peripheral registers are accessed in the I/O address space. All I/O
operations employ 16-bit addresses. The upper byte of the 24-bit address bus is
undefined during all I/O operations (ADDR[23:16] = UU). All I/O operations using
16-bit addresses within the range 0000h–00FFh are routed to the on-chip periph-
erals. External I/O Chip Selects are not generated if the address space pro-
grammed for the I/O Chip Selects overlaps the 0000h–00FFh address range.
Registers at unused addresses within the 0000h–00FFh range assigned to on-
chip peripherals are not implemented. Read access to such addresses returns
unpredictable values and Write access produces no effect. Table 3 diagrams the
register map for the eZ80F91 device.
Table 3. Register Map
Address
(hex) Mnemonic
Name
Reset
CPU Page
(hex) Access #
Product ID
0000 ZDI_ID_L
eZ80 Product ID Low Byte Register
08
R
305
0001 ZDI_ID_H
eZ80 Product ID High Byte Register
00
R
306
0002 ZDI_ID_REV
eZ80 Product ID Revision Register
XX
R
306
Interrupt Priority
0010 INT_P0
Interrupt Priority Register—Byte 0
00
R/W
69
0011 INT_P1
Interrupt Priority Register—Byte 1
00
R/W
69
0012 INT_P2
Interrupt Priority Register—Byte 2
00
R/W
69
0013 INT_P3
Interrupt Priority Register—Byte 3
00
R/W
69
0014 INT_P4
Interrupt Priority Register—Byte 4
00
R/W
69
0015 INT_P5
Interrupt Priority Register—Byte 5
00
R/W
69
Notes:
1. After an external pin reset, the Watch-Dog Timer Control register is reset to 00h. After a Watch-Dog Timer time-
out reset, the Watch-Dog Timer Control register is reset to 20h.
2. When the CPU reads this register, the current sampled value of the port is read.
3. Read Only if RTC is locked; Read/Write if RTC is unlocked.
4. After an external pin reset or a Watch-Dog Timer reset, the RTC Control register is reset to x0xxxx00b. After a
an RTC Alarm sleep-mode recovery reset, the RTC Control register is reset to x0xxxx10b.
5. Read Only if Flash Memory is locked. Read/Write if Flash Memory is unlocked.
PS019209-0504
PRELIMINARY
Register Map