EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 4
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EZ80F91MCU
Manufacturer Part Number
EZ80F91MCU
Description
eZ80Acclaim-TM Flash Microcontrollers
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.EZ80F91MCU.pdf
(396 pages)
- Current page: 4 of 396
- Download datasheet (5Mb)
PS019209-0504
Chip Selects and Wait States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Bus Arbiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Random Access Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Memory and I/O Chip Selects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Memory Chip Select Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
I/O Chip Select Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Wait States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
WAIT Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Chip Selects During Bus Request/Bus Acknowledge Cycles . . . . . . . . . . . 78
Bus Mode Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
eZ80 Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Z80 Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Intel Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Motorola Bus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Chip Select Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
RAM Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Flash Memory Arrangement in the eZ80F91 Device . . . . . . . . . . . . . . . . . 105
Flash Memory Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Reading Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Memory Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Programming Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Erasing Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Information Page Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Flash Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Memory Chip Select Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Reset States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Memory Chip Select Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Intel Bus Mode—Separate Address and Data Buses . . . . . . . . . . . . . . 82
Intel™ Bus Mode—Multiplexed Address and Data Bus . . . . . . . . . . . . 86
Switching Between Bus Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Chip Select x Lower Bound Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Chip Select x Upper Bound Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Chip Select x Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Chip Select x Bus Mode Control Register . . . . . . . . . . . . . . . . . . . . . . . 96
RAM Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
RAM Address Upper Byte Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
MBIST Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
I/O Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Single-Byte I/O Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Multibyte I/O Write (Row Programming) . . . . . . . . . . . . . . . . . . . . . . . 108
Memory Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Mass Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Page Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
P R E L I M I N A R Y
Product Specification
eZ80F91 MCU
Table of Contents
iv
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