ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 197

• Manufacturer Part Number: ez80f92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Random Access Memory
PS015313-0508
The eZ80F92 features 8 KB (8192 bytes) single-port data Random Access Memory
(RAM) for general-purpose use. The eZ80F93 features 4 KB (4096 bytes) general-pur-
pose RAM. RAM can be enabled or disabled, and it can be relocated to the top of any
64 KB page in memory. Data is passed to and from RAM via the 8-bit data bus. On-chip
RAM operates with zero WAIT states.
For the eZ80F92, RAM occupies memory addresses in the range {RAM_ADDR_U[7:0],
E000h
RAM_ADDR_U set to
example, the RAM Address Upper Byte register, RAM_ADDR_U, is set to
Figure 46
able 16 MB address space.
For the eZ80F93 device, RAM occupies memory addresses in the range
{RAM_ADDR_U[7:0],
RAM is enabled with RAM_ADDR_U set to
ory map of on-chip RAM. In this example, the RAM Address Upper Byte register,
RAM_ADDR_U, is set to
very small fraction of the available 16 MB address space.
Location
FFFFFFh
7AFFFFh
7AE000h
000000h
Memory
} to {RAM_ADDR_U[7:0],
is not drawn to scale, as RAM occupies only a very small fraction of the avail-
Figure 46.eZ80F92 On-Chip RAM Memory Addressing Example
General Purpose
RAM
8KB
FFh
F000h
7Ah
.
Figure 46
.
} to {RAM_ADDR_U[7:0],
Figure 46
FFFFh
RAM_ADDR_U
7Ah
displays a memory map of on-chip RAM. In this
is not drawn to scale, as RAM occupies only a
}. Following a RESET, RAM is enabled with
FFh
.
Figure 47
F000h
on page 191 displays a mem-
Product Specification
}. Following a RESET,
Random Access Memory
eZ80F92/eZ80F93
7Ah
.
190