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参数资料
| 型号： | Z8913820FSC |
| 厂商： | ZILOG INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 8-BIT, 20.48 MHz, MIXED DSP, PQFP100 |
| 封装： | QFP-100 |
| 文件页数： | 25/65页 |
| 文件大小： | 2054K |
| 代理商： | Z8913820FSC |
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Z89138/Z89139
Zilog
Voice Processing Controllers
DS97TAD0201
P R E L I M I N A R Y
31
1
Register File. The standard Z8 register file consists of four
I/O port registers, 236 general-purpose registers, and 15
control and status registers (R0-R3, R4-R239, and R241-
R255, respectively). The instructions access registers di-
rectly or indirectly through an 8-bit address field. This al-
lows a short, 4-bit register address using the Register
Pointer (Figure 19). In the 4-bit mode, the register file is
divided into 16 working register groups, each occupying 16
continuous locations. The Register Pointer addresses the
starting location of the active working register group (Fig-
ure 20).
Note: Register Group E (Registers EF-E0) is only access-
ed through a working register and indirect addressing
modes.
RAM Protect. The upper portion of the Z8’s RAM address
spaces 80H to EFH (excluding the control registers) is pro-
tected from reading and writing. The RAM Protect bit op-
tion is mask-programmable and is selected by the custom-
er when the ROM code is submitted. After the mask option
is selected, the user activates the RAM Protect from the in-
ternal ROM code by loading a bit D6 in the IMR register to
either a 0 (OFF) or a 1 (ON). A 1 in D6 indicates RAM Pro-
tect enabled.
Stack. The Z8’s external data memory or the internal reg-
ister file is used for the stack. The 16-bit Stack Pointer
(R255-R254) is used for the external stack which can re-
side only from 24576 to 65535 in ROM mode or 0 to 65535
in ROMless mode. An 8-bit Stack Pointer (R255) is used
for the internal stack residing within the 236 general-pur-
pose registers (R239-R4). SPH can be used as a general-
purpose register when using internal stack only.
Expanded Register File. The register file on the Z8 has
been expanded to allow for additional system control reg-
isters and for mapping of additional peripheral devices
along with I/O ports into the register address area. The Z8
register address space has been implemented as 16
banks of 16 register groups per bank (Figure 20). These
register banks are known as the ERF (Expanded Register
File). Bits 7-4 of register RP (Register Pointer) select the
working register group. Bits 3-0 of register RP select the
Expanded Register bank (Figure 21).
The SMR register, WDT Register, control and data regis-
ters for Port 4 and Port 5, and the DSP control register are
located in Bank F of the Expanded Register File. Bank B
of the Expanded Register File consists of the Mailbox In-
terface through which the Z8 and the DSP communicate.
The rest of the Expanded Register is not physically imple-
mented and is open for future expansion.
Figure 19. Register Pointer Register
Figure 20. Register Pointer
D7 D6
D5
D4
D3
D2
D1
D0
R253 RP
Expanded Register File Bank
Working Register Group
The upper nibble of the register file address
provided by the register pointer specifies
the active working-register group
r7
r6
r5
r4
R253
R239
I/O Ports
Specified Working
Register Group
The upper nibble
of the register
file address
provided by the
instruction points
to the specified
working-register
group
R15
R3
R255
R240
r3
r2
r1
r0
Group 15 (F) Control Registers
Group 14 (E)
Group 13 (D)
Group 4 (4)
Group 3 (3)
Group 2 (2)
Group 1 (1)
Group 0 (0)
R223
R79
R63
R47
R31
R0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| Z8913829ASC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| Z8913829FSC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| Z89139 | 制造商:ZILOG 制造商全称:ZILOG 功能描述:Voice Processing Controllers |
| Z8913920ASC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| Z8913920FSC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
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