參數(shù)資料
型號(hào)： MC68334GCEH16
廠商： Freescale Semiconductor
文件頁數(shù)： 70/76頁
文件大?。?/td> 0K
描述： IC MCU 16MHZ 2K RAM 132-PQFP
標(biāo)準(zhǔn)包裝： 36
系列： M683xx
核心處理器： CPU32
芯體尺寸： 32-位
速度： 16MHz
連通性： EBI/EMI，UART/USART
輸入/輸出數(shù)： 47
程序存儲(chǔ)器類型： ROMless
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8/10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 132-BQFP 緩沖式
包裝： 托盤
MC68334
72
MC68334TS/D REV. 1
7 Standby RAM with TPU Emulation
The TPURAM module contains a 1-Kbyte array of fast (two bus cycle) static RAM, which is especially
useful for system stacks and variable storage. Alternately, it can be used by the TPU as emulation RAM
for new timer algorithms.
7.1 Overview
The 1-Kbyte TPURAM array occupies the top 1024 bytes of a 2-Kbyte block (addresses $400 to $7FF
when the ADDR11 bit in TRAMBAR = 0; addresses $0C00 to $0FFF when the ADDR11 bit in TRAM-
BAR = 1). The block can be mapped to any 2-Kbyte boundary in the address map, but must not overlap
the module control registers (overlap makes the registers inaccessible). Data can be read or written in
bytes, word, or long words. TPURAM responds to both program and data space accesses. Data can be
read or written in bytes, word, or long words. The TPURAM is powered by VDD in normal operation.
During power-down, the TPURAM contents are maintained by power on standby voltage pin VSTBY.
Power switching between sources is automatic.
Access to the TPURAM array is controlled by the RASP field in TRAMMCR. This field can be encoded
so that TPURAM responds to both program and data space accesses. This allows code to be executed
from TPURAM, and permits the use of program counter relative addressing mode for operand fetches
from the array.
An address map of the TPURAM control registers follows. All TPURAM control registers are located in
supervisor data space.
Y = M111, where M is the logic state of the MM bit in the SIMCR.
7.2 TPURAM Register Block
There are three TPURAM control registers: the TPURAM module configuration register (TRAMMCR),
the TPURAM test register (TRAMTST), and the TPURAM array base address registers (TRAMBAR).
There is an 8-byte minimum register block size for the module. Unimplemented register addresses are
read as zeros, and writes have no effect.
7.3 TPURAM Registers
Table 28 TPURAM Control Register Address Map
Access
Address
15
8
7
0
S
$YFFB00
TPURAM MODULE CONFIGURATION REGISTER (TRAMMCR)
S
$YFFB02
TPURAM TEST REGISTER (TRAMTST)
S
$YFFB04
TPURAM BASE ADDRESS REGISTER (TRAMBAR)
$YFFB06–
$YFFB3F
NOT USED
TRAMMCR
— TPURAM Module Configuration Register
$YFFB00
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
STOP
0
RASP
NOT USED
RESET:
0
1
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參數(shù)描述
MC68334GCEH16 制造商:Freescale Semiconductor 功能描述:Microcontroller
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