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參數(shù)資料
| 型號： | Z86E18 |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | USB Device Controller(鍵盤及其它外設(shè)的理想的USB微控制器) |
| 中文描述： | USB設(shè)備控制器（鍵盤及其它外設(shè)的理想的的USB微控制器） |
| 文件頁數(shù)： | 12/31頁 |
| 文件大小： | 311K |
| 代理商： | Z86E18 |
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Z86E18/U18
1.5 MBPS USB Device Controller for Keyboards and HID-Class Peripherals
Zilog
12
P R E L I M I N A R Y
DS97KEY2301
FUNCTIONAL DESCRIPTION
Program Memory.
The 16-bit program counter addresses
4 KB of program memory space at internal locations (Fig-
ure 10).
The first 12 bytes of program memory are reserved for the
interrupt vectors. These locations have five 16-bit vectors
that correspond to the six available interrupts.
Byte 12 to byte 4095 consists of on-chip, mask pro-
grammed ROM. Addresses 4096 and greater are re-
served. The 4 KB program memory is mask programma-
ble.
Register File
. The register file consists of four I/O port reg-
isters, 188 general-purpose registers and 11 control and
status registers (R3–R0, R4–191, and R255–R240, re-
spectively). The instructions can access registers directly
or indirectly through an 8-bit address field. This access al-
lows short, 4-bit register addressing using the Register
Pointer (Figure 11). In the 4-bit mode, the register file is di-
vided into12 working-register groups, each occupying 16
continuous locations. The Register Pointer addresses the
starting location of the active working register group (Fig-
ure 12).
Note:
To use the Bank Pointer: The instruction SRP 01
must be used to access the USB registers in the Expanded
Register File Space. These 8 registers (as defined on pp.
22-26) are available along with those registers from 10h to
BFh. Setting SRP 0 will allow access to the register
locations 0 to BFh, including the I/O port registers at 0–3.
Figure 10. Program Memory Map
12
11
10
9
8
7
6
5
4
3
2
1
0
On-Chip
ROM
Location of
First Byte of
Instruction
Executed
After RESET
Interrupt
Vector
(Lower Byte)
Interrupt
Vector
(Upper Byte)
Reserved
(T0)
(USB)
P31
(IRQ2)
P33
(IRQ1)
P32
(IRQ0)
Reserved
65535
4096
4095
Reserved
Figure 11. Register Pointer Register
D7 D6 D5 D4 D3 D2 D1 D0
R253 RP
Bank Pointer
Working Register
Group
Default setting after RESET = 00000000
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