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LPC4350 датащи(PDF) 108 Page - NXP Semiconductors |
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LPC4350 датащи(HTML) 108 Page - NXP Semiconductors |
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108 / 145 page ![]() LPC4350_30_20_10 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Objective data sheet Rev. 2.1 — 23 September 2011 108 of 145 NXP Semiconductors LPC4350/30/20/10 32-bit ARM Cortex-M4/M0 microcontroller 11.6 SSP interface [1] Tcy(clk) = (SSPCLKDIV (1 + SCR) CPSDVSR) / fmain. The clock cycle time derived from the SPI bit rate Tcy(clk) is a function of the main clock frequency fmain, the SSP peripheral clock divider (SSPCLKDIV), the SSP SCR parameter (specified in the SSP0CR0 register), and the SSP CPSDVSR parameter (specified in the SSP clock prescale register). [2] Tamb = 40 C to 85 C; VDD(REG)(3V3) = 2.0 V to 3.6 V; VDD(IO) = 2.0 V to 3.6 V. [3] Tcy(clk) = 12 Tcy(PCLK). [4] Tamb = 25 C; VDD(REG)(3V3) = 3.3 V; VDD(IO) = 3.3 V. Table 15. Dynamic characteristics: SSP pins in SPI mode Symbol Parameter Conditions Min Max Unit Tcy(PCLK) PCLK cycle time <tbd> - ns Tcy(clk) clock cycle time full-duplex mode [1] <tbd> - ns when only transmitting <tbd> - ns SSP master tDS data set-up time in SPI mode [2] <tbd> Tcy(clk) ns tDH data hold time in SPI mode [2] - <tbd> ns tv(Q) data output valid time in SPI mode [2] - <tbd> ns th(Q) data output hold time in SPI mode [2] - <tbd> ns SSP slave tDS data set-up time in SPI mode [3][4] <tbd> - ns tDH data hold time in SPI mode [3][4] <tbd> T cy(PCLK) + <tbd> -ns tv(Q) data output valid time in SPI mode [3][4] -<tbd> T cy(PCLK) + <tbd> ns th(Q) data output hold time in SPI mode [3][4] -<tbd> T cy(PCLK) + <tbd> ns |
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